Fix stats in MOI wrapper

[blegat]

Closes https://github.com/JuliaSmoothOptimizers/NLPModelsJuMP.jl/issues/166

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Files	Coverage Δ
src/MOI_wrapper.jl	89.23% <100.00%> (+89.23%)	:arrow_up:

... and 1 file with indirect coverage changes

:loudspeaker: Thoughts on this report? Let us know!.

[github-actions[bot]]

Package name	latest	stable
NLSProblems.jl
OptimizationProblems.jl

[amontoison]

Thanks @blegat!