flips signs of quadslack for maximization, fixes 142

[LukasBarner]

fixes #142

[joaquimg]

@LukasBarner can you fix format so that we can merge?

[codecov]

Codecov Report

Base: 93.00% // Head: 94.58% // Increases project coverage by +1.58% 🎉

Coverage data is based on head (69b499a) compared to base (b9d2581).
Patch has no changes to coverable lines.

❗ Current head 69b499a differs from pull request most recent head 84bac98. Consider uploading reports for the commit 84bac98 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #150      +/-   ##
==========================================
+ Coverage   93.00%   94.58%   +1.58%     
==========================================
  Files          12       12              
  Lines         672      702      +30     
==========================================
+ Hits          625      664      +39     
+ Misses         47       38       -9     

Impacted Files	Coverage Δ
src/dual_equality_constraints.jl	91.72% <ø> (+0.67%)	⬆️
src/utils.jl	100.00% <0.00%> (ø)
src/dual_sets.jl	100.00% <0.00%> (ø)
src/dual_names.jl	75.00% <0.00%> (ø)
src/structures.jl	100.00% <0.00%> (ø)
src/constrained_variables.jl	100.00% <0.00%> (ø)
src/add_dual_cone_constraint.jl	100.00% <0.00%> (ø)
src/objective_coefficients.jl	98.07% <0.00%> (+0.16%)	⬆️
src/MOI_wrapper.jl	92.65% <0.00%> (+0.25%)	⬆️
... and 3 more

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[LukasBarner]

OK, think I have this fixed as well now :D