Don't include 1-player alliances in players and resource tabs.

[asvitkine]

Change Summary & Additional Notes

This fixes a 2.6 regression as previously this logic was in AbstractStatPanel.getAllianceMap().

Release Note

[codecov]

Codecov Report

Merging #10571 (8df12a0) into master (27d0635) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master   #10571      +/-   ##
============================================
- Coverage     28.09%   28.08%   -0.02%     
+ Complexity     7985     7983       -2     
============================================
  Files          1197     1197              
  Lines         76945    76953       +8     
  Branches      10536    10538       +2     
============================================
- Hits          21617    21610       -7     
- Misses        53362    53377      +15     
  Partials       1966     1966              

Impacted Files	Coverage Δ
...n/java/games/strategy/triplea/ui/EconomyPanel.java	0.00% <0.00%> (ø)
...main/java/games/strategy/triplea/ui/StatPanel.java	0.00% <0.00%> (ø)
...rc/main/java/games/strategy/net/nio/NioReader.java	82.50% <0.00%> (-3.75%)	⬇️
...rc/main/java/games/strategy/net/nio/NioWriter.java	79.16% <0.00%> (-2.09%)	⬇️
.../main/java/games/strategy/net/ClientMessenger.java	62.50% <0.00%> (-2.09%)	⬇️

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