Properly hide the MechWarriors grouping when using individual role filters

[Windchild292]

No description provided.

[codecov]

Codecov Report

Merging #2841 (fd9d9fc) into master (d629d67) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #2841      +/-   ##
============================================
- Coverage     10.64%   10.64%   -0.01%     
+ Complexity     3888     3886       -2     
============================================
  Files           721      721              
  Lines        100541   100541              
  Branches      16412    16412              
============================================
- Hits          10706    10703       -3     
- Misses        88457    88459       +2     
- Partials       1378     1379       +1     

Impacted Files	Coverage Δ
MekHQ/src/mekhq/gui/enums/PersonnelFilter.java	0.00% <0.00%> (ø)
...ekHQ/src/mekhq/campaign/market/ContractMarket.java	59.60% <0.00%> (-1.20%)	⬇️
MekHQ/src/mekhq/campaign/universe/Faction.java	66.02% <0.00%> (-0.65%)	⬇️
.../mekhq/campaign/universe/FactionBorderTracker.java	70.91% <0.00%> (+2.04%)	⬆️

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