Issue 4085: MegaMek fails to load Dropship sent from MekHQ

[psikomonkie]

Fixes #4085

We don't actually track bay personnel. You can assign units to a dropship, but it doesn't change the nCrew for the ship, which MegaMek assumes will include bay personnel, so when loading a spaceship from MekHQ to MegaMek, it will calculate the current crew by taking nCrew and removing the assumed bay personnel - this is what prevents Spaceships from being moved form MHQ to MM, they will never have enough crew.

When spaceships are loaded from data, the crew includes the bay personnel, so the calculation passes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.49%. Comparing base (519101f) to head (8d8a54a).
Report is 48 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5255      +/-   ##
============================================
- Coverage     10.50%   10.49%   -0.01%     
+ Complexity     6044     6038       -6     
============================================
  Files           957      957              
  Lines        134716   134725       +9     
  Branches      19572    19577       +5     
============================================
- Hits          14149    14142       -7     
- Misses       119216   119232      +16     
  Partials       1351     1351              

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