fix(playback-core): Make sure we do not apply holdback to seekable when live streams have ended.

[cjpillsbury]

In other words, seekable should only apply holdback (baked into hls.liveSyncPosition) while the live stream is "active"/"still live".

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[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 81.72%. Comparing base (acb8783) to head (ef8f8d8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
- Coverage   81.76%   81.72%   -0.05%     
==========================================
  Files          40       40              
  Lines        8517     8524       +7     
  Branches      468      468              
==========================================
+ Hits         6964     6966       +2     
- Misses       1547     1552       +5     
  Partials        6        6              

Files	Coverage Δ
packages/playback-core/src/index.ts	72.25% <37.50%> (-0.12%)	⬇️

... and 1 file with indirect coverage changes

[AdamJaggard]

I think this is the one!