fix audio from alwaysAvailableFile not being streamed

[aler9]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.00%. Comparing base (10e0271) to head (3afbe45).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/stream/offline_sub_stream_track.go	0.00%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5535      +/-   ##
==========================================
- Coverage   60.07%   60.00%   -0.07%     
==========================================
  Files         200      200              
  Lines       16848    16866      +18     
==========================================
  Hits        10121    10121              
- Misses       5859     5877      +18     
  Partials      868      868              

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