test: change source for live DASH playback test to fix test failures

[gesinger]

The current live DASH playback test source uses a source where segments are referenced by a SegmentTemplate and duration, but the server doesn't have time syncing and appears to be about two minutes behind local time. This leads to requests for segments beyond expected and occasional failures.

Until that issue is fixed in VHS, switch to a live source that uses SegmentTemplate, to be a more reliable basic live DASH playback test.

Requirements Checklist

• [ ] Feature implemented / Bug fixed
• [ ] If necessary, more likely in a feature request than a bug fix
  • [ ] Unit Tests updated or fixed
  • [ ] Docs/guides updated
  • [ ] Example created (starter template on JSBin)
• [ ] Reviewed by Two Core Contributors

[codecov[bot]]

Codecov Report

Merging #1303 (6be36f7) into main (23bbf84) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1303   +/-   ##
=======================================
  Coverage   86.31%   86.31%           
=======================================
  Files          39       39           
  Lines        9855     9855           
  Branches     2298     2298           
=======================================
  Hits         8506     8506           
  Misses       1349     1349           

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