fix: use paren media sequence sync for audio and vtt, since they are opt-in features and can be enabled after main init.

[dzianis-dashkevich]

Description

audio and vtt segment loaders are opt-in features and can be enabled after the main start. (eg: via UI)
We should align the media sequence start time with the main for them.

Specific Changes proposed

Use parent for vtt and audio media sequence storages.
parent should be main.

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.29%. Comparing base (be289f6) to head (89a8b9d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1505      +/-   ##
==========================================
+ Coverage   86.27%   86.29%   +0.01%     
==========================================
  Files          43       43              
  Lines       10886    10901      +15     
  Branches     2506     2508       +2     
==========================================
+ Hits         9392     9407      +15     
  Misses       1494     1494              

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[adrums86]

makes sense. LGTM!