Fix: treat SNES enhancement chips as non-retail

[emmercm]

Fixes: #1342

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.44%. Comparing base (4218679) to head (9511a91).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1480   +/-   ##
=======================================
  Coverage   92.44%   92.44%           
=======================================
  Files         122      122           
  Lines        7634     7637    +3     
  Branches     1752     1751    -1     
=======================================
+ Hits         7057     7060    +3     
  Misses        552      552           
  Partials       25       25           

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