Adjust Bounds Calculation in getUnoccupiedAdjacentCoords

[IllianiCBT]

• Reduced track width and height by one to account for zero-based indexing in coordinate calculations.

Fix #5779

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 10.19%. Comparing base (fd739ba) to head (3b3df3d).
Report is 28 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5785      +/-   ##
============================================
- Coverage     10.21%   10.19%   -0.02%     
+ Complexity     6076     6059      -17     
============================================
  Files          1010     1010              
  Lines        139310   139310              
  Branches      20448    20448              
============================================
- Hits          14231    14206      -25     
- Misses       123703   123729      +26     
+ Partials       1376     1375       -1     

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