Fix MOI.supports for MOI.ConstraintName of quadratic constraints

[odow]

Closes #185

[joaquimg]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.15%. Comparing base (87406b4) to head (c94014f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #186   +/-   ##
=======================================
  Coverage   97.15%   97.15%           
=======================================
  Files           5        5           
  Lines        1158     1161    +3     
=======================================
+ Hits         1125     1128    +3     
  Misses         33       33           

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