fix 398

[ericphanson]

fix #398 by allowing fix!'d variables in quadform

[codecov]

Codecov Report

Merging #399 into master will increase coverage by 0.00%.
The diff coverage is 88.88%.

@@           Coverage Diff           @@
##           master     #399   +/-   ##
=======================================
  Coverage   88.42%   88.43%           
=======================================
  Files          75       75           
  Lines        3508     3527   +19     
=======================================
+ Hits         3102     3119   +17     
- Misses        406      408    +2     

Impacted Files	Coverage Δ
src/atoms/second_order_cone/quadform.jl	66.66% <60.00%> (-2.57%)	⬇️
src/problem_depot/problems/socp.jl	100.00% <100.00%> (ø)

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