Fix #6544: Restored Ability to Salvage Turrets

[IllianiCBT]

• Removed code that prevented players from salvaging turrets, specifically gun emplacements.

Fix #6544

Dev Notes

This was leftover code from 50.03 when we first prevented the player from acquiring gun emplacements, prior to us implementing the Unsupported Unit class.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 11.43%. Comparing base (f44952c) to head (3e9cd2a).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #6584   +/-   ##
=========================================
  Coverage     11.43%   11.43%           
- Complexity     6451     6453    +2     
=========================================
  Files          1087     1087           
  Lines        139447   139444    -3     
  Branches      21560    21559    -1     
=========================================
+ Hits          15944    15952    +8     
+ Misses       121908   121898   -10     
+ Partials       1595     1594    -1     

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