feat: use commas in encounter listing

[midgleyc]

For consistency with adventure results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e5f29e7) 37.12% compared to head (a93c329) 37.12%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2140      +/-   ##
============================================
- Coverage     37.12%   37.12%   -0.01%     
+ Complexity    19500    19499       -1     
============================================
  Files          1102     1102              
  Lines        168450   168450              
  Branches      35603    35603              
============================================
- Hits          62540    62533       -7     
- Misses        95923    95933      +10     
+ Partials       9987     9984       -3     

Files	Coverage Δ
...sourceforge/kolmafia/session/EncounterManager.java	83.33% <100.00%> (ø)

... and 3 files with indirect coverage changes

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