Fix 2175

[fwesselm]

Fix #2175

• Remove assertion and explicitly set bound type for integer variables (where the simple lower or upper bound is used in the transformation).
• Testing on 800+ MIPs showed that there is a slight improvement in the shifted geometric mean of the branching nodes while the shifted geometric mean of the running times is almost identical. There were no regressions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.75%. Comparing base (60df046) to head (67084bb).
Report is 3 commits behind head on latest.

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2177      +/-   ##
==========================================
- Coverage   78.75%   78.75%   -0.01%     
==========================================
  Files         345      345              
  Lines       83165    83172       +7     
==========================================
+ Hits        65498    65503       +5     
- Misses      17667    17669       +2     

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