test(text-track-controls): fix failing test caused by incompatibility between PRs

[misteroneill]

Description

An incompatibility was introduced between a test written for #7604 and the changes introduced in #7633 - this addresses it to unblock release of 7.19.

Specific Changes proposed

Since text tracks no longer rely on the timeupdate event (though they still have a timeupdateHandler method), triggering the chapter menu item update on timeupdate simply did not work. Calling timeupdateHandler() manually does.

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)
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

Merging #7686 (d58e80f) into main (28bdc7d) will increase coverage by 0.07%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main    #7686      +/-   ##
==========================================
+ Coverage   80.83%   80.91%   +0.07%     
==========================================
  Files         116      116              
  Lines        7451     7455       +4     
  Branches     1805     1806       +1     
==========================================
+ Hits         6023     6032       +9     
+ Misses       1428     1423       -5     

Impacted Files	Coverage Δ
...ar/text-track-controls/chapters-track-menu-item.js	80.00% <ø> (+18.09%)	⬆️
...control-bar/text-track-controls/chapters-button.js	89.06% <92.30%> (-1.68%)	⬇️
src/js/tracks/text-track.js	92.94% <0.00%> (+0.64%)	⬆️
...rc/js/control-bar/progress-control/time-tooltip.js	84.61% <0.00%> (+2.56%)	⬆️

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