fix(spatial-navigation): refocus available also to the close button of the error modal

[CarlosVillasenor]

Description

This PR will make the refocus available not only to the buttons of the error modal but also to the close button of the error modal on the event of 'aftermodalfill'.

Specific Changes proposed

Allow the spatial-navigation to refocus the error modal when error modal appears.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 83.73%. Comparing base (daf40bd) to head (9b3ba9b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8819      +/-   ##
==========================================
+ Coverage   83.11%   83.73%   +0.61%     
==========================================
  Files         120      120              
  Lines        8050     8052       +2     
  Branches     1930     1931       +1     
==========================================
+ Hits         6691     6742      +51     
+ Misses       1359     1310      -49     

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