TOML: fix converted tabular data printing

[aviatesk]

Previously the printing pass for converted data only works for
non-tabular data (like simple number literals), and it doesn't work for
Dict or Arrays. Rather it leads to runtime error because we don't
pass over the same by keyword argument through recursive calls and it
may not be assigned:

julia> struct MyStruct
           a::Int
       end

julia> data = Dict(:foo => MyStruct(1))
Dict{Symbol, MyStruct} with 1 entry:
  :foo => MyStruct(1)

julia> TOML.print(data; softed=true) do x
           x isa MyStruct && return Dict(:bar => x.a)
       end
foo = ERROR: UndefKeywordError: keyword argument by not assigned
Stacktrace:
 [1] printvalue(f::var"#3#4", io::Base.TTY, value::Dict{Symbol, Int64}; sorted::Bool)
   @ TOML.Internals.Printer ~/julia/julia2/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:46
 [2] #invokelatest#2
   @ ./essentials.jl:728 [inlined]
 [3] #printvalue#2
   @ ~/julia/julia2/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:44 [inlined]
 [4] _print(f::var"#3#4", io::Base.TTY, a::Dict{Symbol, MyStruct}, ks::Vector{String}; indent::Int64, first_block::Bool, sorted::Bool, by::Function)
   @ TOML.Internals.Printer ~/julia/julia2/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:88
 [5] #print#14
   @ ~/julia/julia2/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:129 [inlined]
 [6] print(f::var"#3#4", a::Dict{Symbol, MyStruct}; sorted::Bool, by::Function)
   @ TOML.Internals.Printer ~/julia/julia2/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:130
 [7] top-level scope
   @ REPL[4]:1

Originally reported by the following JET analysis:

julia> using JET, Pkg

julia> @report_call Pkg.project()
═════ 3 possible errors found ═════
┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/API.jl:103 Pkg.API.EnvCache()
│┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/Types.jl:285 #self#(Pkg.Types.nothing)
││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/Types.jl:288 Pkg.Types.read_project(project_file)
│││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/project.jl:138 Pkg.Types.sprint(Pkg.Types.showerror, e)
││││┌ @ strings/io.jl:106 Base.#sprint#412(Core.tuple(Base.nothing, 0, #self#, f), args...)
│││││┌ @ strings/io.jl:112 f(Core.tuple(s), args...)
││││││┌ @ toml_parser.jl:326 Base.TOML.point_to_line(Base.getproperty(err, :str), pos, pos, io)
│││││││ for 1 of union split cases, no matching method found for call signatures (Tuple{typeof(Base.TOML.point_to_line), Nothing, Int64, Int64, IOBuffer})): Base.TOML.point_to_line(Base.getproperty(err::Base.TOML.ParserError, :str::Symbol)::Union{Nothing, String}, pos::Int64, pos::Int64, io::IOBuffer)
││││││└──────────────────────
│││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/project.jl:142 Pkg.Types.Project(raw)
││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/project.jl:124 Base.setproperty!(project, :targets, Pkg.Types.read_project_targets(Pkg.Types.get(raw, "targets", Pkg.Types.nothing), project))
│││││┌ @ Base.jl:35 Base.convert(Base.fieldtype(Base.typeof(x), f), v)
││││││┌ @ abstractdict.jl:523 _(x)
│││││││┌ @ dict.jl:104 Base.setindex!(h, v, k)
││││││││┌ @ dict.jl:382 Base.convert(_, v0)
│││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/LinearAlgebra/src/factorization.jl:58 _(f)
││││││││││ no matching method found for call signature (Tuple{Type{Vector{String}}, LinearAlgebra.Factorization}): _::Type{Vector{String}}(f::LinearAlgebra.Factorization)
│││││││││└─────────────────────────────────────────────────────────────────────────────────────────────────
││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/Types.jl:305 Pkg.Types.write_env_usage(manifest_file, "manifest_usage.toml")
│││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/Types.jl:436 Pkg.Types.sprint(#35)
││││┌ @ strings/io.jl:106 Base.#sprint#412(Core.tuple(Base.nothing, 0, #self#, f), args...)
│││││┌ @ strings/io.jl:112 f(Core.tuple(s), args...)
││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/Pkg/src/Types.jl:437 TOML.print(io, Pkg.Types.Dict(Pkg.Types.=>(Core.getfield(#self#, :source_file), Base.vect(Pkg.Types.Dict(Pkg.Types.=>("time", Pkg.Types.now()))))))
│││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:131 TOML.Internals.Printer.#print#16(false, TOML.Internals.Printer.identity, #self#, io, a)
││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:131 Core.kwfunc(TOML.Internals.Printer._print)(Core.apply_type(Core.NamedTuple, (:sorted, :by))(Core.tuple(sorted, by)), TOML.Internals.Printer._print, TOML.Internals.Printer.nothing, io, a)
│││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:76 #s848(_2, _3, f, io, a, Base.getindex(TOML.Internals.Printer.String))
││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:76 TOML.Internals.Printer.#_print#11(indent, first_block, sorted, by, _3, f, io, a, ks)
│││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:88 Core.kwfunc(TOML.Internals.Printer.printvalue)(Core.apply_type(Core.NamedTuple, (:sorted,))(Core.tuple(sorted)), TOML.Internals.Printer.printvalue, f, io, value)
││││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:25 TOML.Internals.Printer.#printvalue#1(sorted, _3, f, io, value)
│││││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:29 Core.kwfunc(TOML.Internals.Printer._print)(Core.apply_type(Core.NamedTuple, (:sorted,))(Core.tuple(sorted)), TOML.Internals.Printer._print, f, io, x)
││││││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:76 #s848(_2, _3, f, io, a, Base.getindex(TOML.Internals.Printer.String))
│││││││││││││││┌ @ /Users/aviatesk/julia/julia/usr/share/julia/stdlib/v1.7/TOML/src/print.jl:76 Core.throw(Core.UndefKeywordError(:by))
││││││││││││││││ UndefKeywordError: keyword argument by not assigned
│││││││││││││││└────────────────────────────────────────────────────────────────────────────────
Pkg.API.ProjectInfo

With this PR, everything should work:

After

julia> TOML.print(data; sorted=true) do x
           x isa MyStruct && return Dict(:bar => x.a)
       end
[foo]
bar = 1