Fix check in Highs::qFormatOk

[fwesselm]

It looks like ok_format will always be true currently.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.82%. Comparing base (cea9b0c) to head (57d92ef).
⚠️ Report is 1 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #3003      +/-   ##
==========================================
- Coverage   72.83%   72.82%   -0.01%     
==========================================
  Files         417      417              
  Lines      101979   101983       +4     
  Branches    16432    16432              
==========================================
- Hits        74273    74272       -1     
- Misses      27430    27435       +5     
  Partials      276      276              

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