fix: contrast completion meta contrast cloud editor themes

[akoreman]

Issue #, if available: NA

Description of changes: Fix contrast of completion meta tag in Cloud Editor themes to comply with 4.5:1 contrast requirement.

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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 (b3dfa11) to head (d30b021).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5558   +/-   ##
=======================================
  Coverage   86.66%   86.66%           
=======================================
  Files         593      593           
  Lines       42920    42920           
  Branches     7125     7125           
=======================================
  Hits        37198    37198           
  Misses       5722     5722           

Flag	Coverage Δ
unittests	86.66% <ø> (ø)

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