Only display support type if game has multiple support types

[ron-murhammer]

Overview

Addresses post: https://forums.triplea-game.org/topic/942/unit-tooltip-improvements-poll/68

Functional Changes

Unit tooltip only displays support type if game has multiple support types (primarily used to avoid showing "ArtyOld" for simple maps).

Manual Testing Performed

• Tested tooltips on 270BC and revised

[codecov-io]

Codecov Report

Merging #3646 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #3646      +/-   ##
============================================
- Coverage     22.55%   22.55%   -0.01%     
- Complexity     5983     5984       +1     
============================================
  Files           822      822              
  Lines         71032    71033       +1     
  Branches      11479    11481       +2     
============================================
  Hits          16019    16019              
- Misses        52922    52924       +2     
+ Partials       2091     2090       -1

Impacted Files	Coverage Δ	Complexity Δ
...s/strategy/triplea/attachments/UnitAttachment.java	43.12% <0%> (-0.03%)	253 <0> (ø)
...tegy/engine/message/unifiedmessenger/EndPoint.java	76.47% <0%> (-4.42%)	14% <0%> (-1%)
.../strategy/triplea/odds/calculator/DummyPlayer.java	35.95% <0%> (+1.12%)	10% <0%> (+1%)	⬆️
...rategy/triplea/attachments/UnitTypeComparator.java	53.84% <0%> (+7.69%)	13% <0%> (+1%)	⬆️

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[ron-murhammer]

Merging as minor unit tooltip change.

[DanVanAtta]

@ron-murhammer agree this is a minor update, but I think we should have let the standard review and merge process take hold here.