Fix incorrect conversion in Cbc_loadProblem

[odow]

Potential fix for #183

[codecov]

Codecov Report

Merging #184 (f6289a0) into master (1b24948) will increase coverage by 6.83%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   54.61%   61.44%   +6.83%     
==========================================
  Files           3        3              
  Lines         542      581      +39     
==========================================
+ Hits          296      357      +61     
+ Misses        246      224      -22     

Impacted Files	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	87.71% <100.00%> (+6.87%)	⬆️
src/gen/libcbc_api.jl	21.92% <0.00%> (+9.24%)	⬆️

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[odow]

@DrChainsaw can you try this branch? Looks like we had a cheeky off-by-1 error. I wonder if this was the cause of our troubles in #151

[DrChainsaw]

This seemed to have done the trick!

I could run testsos 100 times in a loop and the testcase which exposed the issue in NaiveNASflux also passes with the branch.