fix VP9 decoding on iOS (https://github.com/bluenviron/mediamtx/issues/3060)

[aler9]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.49%. Comparing base (2e32d1b) to head (3361d13).
Report is 1 commits behind head on main.

❗ Current head 3361d13 differs from pull request most recent head e7820f9. Consider uploading reports for the commit e7820f9 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #553   +/-   ##
=======================================
  Coverage   81.49%   81.49%           
=======================================
  Files         115      115           
  Lines       11474    11474           
=======================================
  Hits         9351     9351           
  Misses       1721     1721           
  Partials      402      402           

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