Updated Prisoner Defection Calculation to Optionally Include Loyalty

[IllianiCBT]

The defection computation now considers the individual's loyalty modifier (if enabled), expanding the factors considered in determining if a prisoner defects.

The defection calculation is as follows:
8 + enemy unit rating - campaign unit rating + loyalty modifier

Loyalty modifier is only used if loyalty modifiers are enabled in campaign options.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.27%. Comparing base (f7bd31c) to head (69b3a88).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #4394   +/-   ##
=========================================
  Coverage     10.27%   10.27%           
  Complexity     5811     5811           
=========================================
  Files           925      925           
  Lines        126031   126029    -2     
  Branches      18627    18628    +1     
=========================================
  Hits          12945    12945           
+ Misses       111811   111809    -2     
  Partials       1275     1275           

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