[BACKEND] Replicate yt-dlp postprocessor flags better for sponsorblock

[jmbannon]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.42%. Comparing base (2deafc9) to head (fa4ab60).

Files with missing lines	Patch %	Lines
src/ytdl_sub/plugins/chapters.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1350      +/-   ##
==========================================
- Coverage   92.44%   92.42%   -0.03%     
==========================================
  Files         116      116              
  Lines        7650     7652       +2     
==========================================
  Hits         7072     7072              
- Misses        578      580       +2     

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