fix: Don't request fullscreen from document PIP window

[mister-ben]

Description

Double clicking the document pip window requests fullscreen but this fails. The gesture on the pip window can't initiate fullscreen.
Fixes #8877

Specific Changes proposed

Change the default double click action to just exit pip. This is the same behaviour as before without the error, as requestFullScreen() calls exitPictureInPicture();

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 83.21%. Comparing base (b1dee92) to head (8d5fc26).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8881   +/-   ##
=======================================
  Coverage   83.21%   83.21%           
=======================================
  Files         120      120           
  Lines        8066     8068    +2     
  Branches     1937     1938    +1     
=======================================
+ Hits         6712     6714    +2     
  Misses       1354     1354           

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