Hangar Tab: Maintenance Colour No Longer Shows with Maintenance Disabled

[Windchild292]

This fixes a bug I noticed while testing.

[codecov]

Codecov Report

Merging #2694 (33a390e) into master (1dbf2d2) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2694      +/-   ##
============================================
- Coverage     10.65%   10.64%   -0.02%     
+ Complexity     3849     3841       -8     
============================================
  Files           712      712              
  Lines         99124    99124              
  Branches      16304    16304              
============================================
- Hits          10564    10554      -10     
- Misses        87188    87190       +2     
- Partials       1372     1380       +8     

Impacted Files	Coverage Δ
MekHQ/src/mekhq/gui/model/UnitTableModel.java	0.00% <0.00%> (ø)
...ekhq/campaign/universe/RandomFactionGenerator.java	56.40% <0.00%> (-2.00%)	⬇️
...ekHQ/src/mekhq/campaign/market/ContractMarket.java	57.94% <0.00%> (-1.01%)	⬇️
.../mekhq/campaign/mission/enums/AtBContractType.java	12.58% <0.00%> (-0.70%)	⬇️
MekHQ/src/mekhq/campaign/universe/Faction.java	67.10% <0.00%> (ø)
MekHQ/src/mekhq/campaign/universe/Systems.java	42.23% <0.00%> (+0.79%)	⬆️

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