fix: enable keyboard controls on menu items

[usmanonazim]

Description

This fix addresses an issue that was introduced in this refactor. At the moment, all key down events that are supposed to interact with the menu-item component are now being ignored, meaning you are unable to interact with most of the menu items in the control bar (e.g. captions settings). This PR fixes that by only ignoring key down events that are normally ignored by the menu-item.

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
  • Has no DOM changes which impact accessiblilty or trigger warnings (e.g. Chrome issues tab)
  • Has no changes to JSDoc which cause npm run docs:api to error
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.01%. Comparing base (fa9c41c) to head (86a61ce).

Files	Patch %	Lines
src/js/menu/menu-item.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8777   +/-   ##
=======================================
  Coverage   83.01%   83.01%           
=======================================
  Files         119      119           
  Lines        7993     7993           
  Branches     1923     1923           
=======================================
  Hits         6635     6635           
  Misses       1358     1358           

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