Fix: not determined folding widgets for html tags

[mkslanc]

Issue #, if available: #5547

Description of changes:
This change should fix the regression related to determining folding widgets for HTML tags, which was introduced by #5491.

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Pull Request Checklist:

• 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 86.66%. Comparing base (15f6be2) to head (ced2687).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5548      +/-   ##
==========================================
+ Coverage   86.64%   86.66%   +0.02%     
==========================================
  Files         593      593              
  Lines       42839    42920      +81     
  Branches     7120     7125       +5     
==========================================
+ Hits        37117    37198      +81     
  Misses       5722     5722              

Flag	Coverage Δ
unittests	86.66% <100.00%> (+0.02%)	⬆️

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