Corrected Unit Site Comparison Logic

[IllianiCBT]

Replaced SITE_FACILITY_MAINTENANCE with SITE_FACILITY_BASIC in the comparison logic for unit site determination. This ensures planetary modifiers are only applied in appropriate circumstances.

Closes #5184

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.50%. Comparing base (bce5f63) to head (aee5977).
Report is 20 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5214      +/-   ##
============================================
- Coverage     10.52%   10.50%   -0.02%     
+ Complexity     6047     6029      -18     
============================================
  Files           957      957              
  Lines        134523   134523              
  Branches      19545    19545              
============================================
- Hits          14154    14128      -26     
- Misses       119018   119035      +17     
- Partials       1351     1360       +9     

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