Use && for logical and

[fwesselm]

I think that using && for logical and in src/mip/HighsMipSolver.cpp would make the code clearer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (77858a1) to head (8591ad4).
Report is 6 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2157      +/-   ##
==========================================
+ Coverage   78.65%   78.70%   +0.04%     
==========================================
  Files         345      345              
  Lines       83072    83092      +20     
==========================================
+ Hits        65342    65394      +52     
+ Misses      17730    17698      -32     

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[jajhall]

Absolutely: my error!