playback: fix bug that messed up duration of last sample of each track

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 55.76%. Comparing base (34b120f) to head (c3860a7).
Report is 1 commits behind head on main.

❗ Current head c3860a7 differs from pull request most recent head 2e08684. Consider uploading reports for the commit 2e08684 to get more accurate results

Files	Patch %	Lines
internal/playback/segment_fmp4.go	81.81%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3210      +/-   ##
==========================================
+ Coverage   55.74%   55.76%   +0.02%     
==========================================
  Files         154      154              
  Lines       16941    16959      +18     
==========================================
+ Hits         9444     9458      +14     
- Misses       6751     6754       +3     
- Partials      746      747       +1     

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[github-actions]

This issue is mentioned in release v1.7.0 🚀
Check out the entire changelog by clicking here