refactor: clear luaA_classes

[cnjhb]

We only added the class to classes without using it.
It may have made sense before, but not anymore.

[actionless]

thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.46%. Comparing base (39143f0) to head (72eee0f).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4071      +/-   ##
==========================================
+ Coverage   90.44%   90.46%   +0.01%     
==========================================
  Files         939      939              
  Lines       60346    60345       -1     
  Branches     1145     1145              
==========================================
+ Hits        54582    54589       +7     
+ Misses       5254     5249       -5     
+ Partials      510      507       -3     

Files with missing lines	Coverage Δ
common/luaclass.c	87.56% <ø> (-0.14%)	⬇️

... and 2 files with indirect coverage changes

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