fix: fix return type of supportsFile modelist

[akoreman]

Issue #, if available: NA

Description of changes: we use String.match, which has a return type of RegExpMatchArray | null, this was not correctly picked up by our type generation. Explicitly set return type in this PR.

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Pull Request Checklist:

• [na] No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.02%. Comparing base (713abb6) to head (b26c83f).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5705      +/-   ##
==========================================
- Coverage   87.02%   87.02%   -0.01%     
==========================================
  Files         598      598              
  Lines       43588    43593       +5     
  Branches     7162     7163       +1     
==========================================
+ Hits        37932    37936       +4     
- Misses       5656     5657       +1     

Flag	Coverage Δ
unittests	87.02% <ø> (-0.01%)	⬇️

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