AI Combat Move Fix Max Enemy Counterattack

[ron-murhammer]

Addresses issue with max enemy counterattack: https://forums.triplea-game.org/topic/105/ai-development-discussion-and-feedback/61

[ron-murhammer]

Merging since minor change to AI.

[codecov-io]

Codecov Report

Merging #3271 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #3271      +/-   ##
============================================
- Coverage     21.54%   21.52%   -0.02%     
+ Complexity     5811     5810       -1     
============================================
  Files           830      831       +1     
  Lines         72673    72726      +53     
  Branches      11845    11856      +11     
============================================
- Hits          15654    15653       -1     
- Misses        54923    54977      +54     
  Partials       2096     2096

Impacted Files	Coverage Δ	Complexity Δ
...games/strategy/triplea/ai/pro/ProCombatMoveAi.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../src/main/java/games/strategy/net/nio/Decoder.java	72.82% <0%> (-1.09%)	24% <0%> (-1%)
...ame-core/src/main/java/tools/image/XmlUpdater.java	0% <0%> (ø)	0% <0%> (?)

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