Re-align --git-ignore line in help message

[ariasuni]

Before:

FILTERING AND SORTING OPTIONS
  -a, --all                  show hidden and 'dot' files
  -d, --list-dirs            list directories as files; don't list their contents
  -L, --level DEPTH          limit the depth of recursion
  -r, --reverse              reverse the sort order
  -s, --sort SORT_FIELD      which field to sort by
  --group-directories-first  list directories before other files
  -D, --only-dirs            list only directories
  -I, --ignore-glob GLOBS    glob patterns (pipe-separated) of files to ignore
  --git-ignore             ignore files mentioned in '.gitignore'
  Valid sort fields:         name, Name, extension, Extension, size, type,
                             modified, accessed, created, inode, and none.
                             date, time, old, and new all refer to modified.

After:

FILTERING AND SORTING OPTIONS
  -a, --all                  show hidden and 'dot' files
  -d, --list-dirs            list directories as files; don't list their contents
  -L, --level DEPTH          limit the depth of recursion
  -r, --reverse              reverse the sort order
  -s, --sort SORT_FIELD      which field to sort by
  --group-directories-first  list directories before other files
  -D, --only-dirs            list only directories
  -I, --ignore-glob GLOBS    glob patterns (pipe-separated) of files to ignore
  --git-ignore               ignore files mentioned in '.gitignore'
  Valid sort fields:         name, Name, extension, Extension, size, type,
                             modified, accessed, created, inode, and none.
                             date, time, old, and new all refer to modified.

Also put the strings in the source code in the same order they appear so that the alignment is «visually obvious».

[cafkafk]

Sorry, I'm out so I'll first be able to merge this tomorrow but LGTM

…

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[cafkafk]

LGTM