fix: nunjucks mode not break completions

[blaggacao]

Issue #, if available:

Description of changes:

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Pull Request Checklist:

• GUESS: 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 86.97%. Comparing base (be9e7d4) to head (0ed7fae).

Additional details and impacted files

@@ Coverage Diff @@ ## master #5638 +/- ## ======================================= Coverage 86.97% 86.97% ======================================= Files 594 594 Lines 43395 43396 +1 Branches 7170 7170 ======================================= + Hits 37742 37743 +1  Misses 5653 5653 

Flag	Coverage Δ
unittests	86.97% <100.00%> (+<0.01%)	⬆️

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[blaggacao]

This isn't going to work as is, and I need jinja anyways, so I concentrate on #5639