Fix: wrong vue-directives regexp

[mkslanc]

Issue #, if available: #5585

Description of changes:

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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 86.78%. Comparing base (a3277ea) to head (52ccafe).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5586      +/-   ##
==========================================
- Coverage   86.78%   86.78%   -0.01%     
==========================================
  Files         594      594              
  Lines       43017    43020       +3     
  Branches     7129     7129              
==========================================
+ Hits        37331    37333       +2     
- Misses       5686     5687       +1     

Flag	Coverage Δ
unittests	86.78% <ø> (-0.01%)	⬇️

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