Fix support for MOI.TimeLimitSec

[odow]

x-ref https://discourse.julialang.org/t/multi-objective-minlp-problem-in-jump/103117

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (38464c2) 90.87% compared to head (76ddb40) 90.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #518      +/-   ##
==========================================
+ Coverage   90.87%   90.88%   +0.01%     
==========================================
  Files           5        5              
  Lines        2422     2425       +3     
==========================================
+ Hits         2201     2204       +3     
  Misses        221      221              

Files Changed	Coverage Δ
src/MOI_wrapper/MOI_wrapper.jl	89.97% <100.00%> (+0.01%)	⬆️

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