Fix math bug in Quick_Distance function

[xezon]

• Split off of Fixed bugs and memleaks #796

This is addressing supposed original game bug.

This function appears to be yet unused in Thyme.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cfa005f) 2.53% compared to head (ff3352c) 2.53%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1113   +/-   ##
========================================
  Coverage     2.53%    2.53%           
========================================
  Files          949      949           
  Lines       110299   110299           
  Branches     18881    18881           
========================================
  Hits          2800     2800           
  Misses      107095   107095           
  Partials       404      404           

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