Fix: generator function's determination and wrong parameter highlighting

[mkslanc]

Issue #, if available: #5257

Description of changes:
This should fix 2 out of 3 problems mentioned in #5257:

1. Generator functions proper highlight
2. Greedy pattern, which wrongly highlighted arguments in function calls

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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 86.64%. Comparing base (7869158) to head (170feb0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5538   +/-   ##
=======================================
  Coverage   86.64%   86.64%           
=======================================
  Files         593      593           
  Lines       42839    42842    +3     
  Branches     7120     7120           
=======================================
+ Hits        37117    37120    +3     
  Misses       5722     5722           

Flag	Coverage Δ
unittests	86.64% <100.00%> (+<0.01%)	⬆️

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