h265: fix DTS extractor compatibility with Apple VT HEVC Hardware Encoder (bluenviron/mediamtx#4892)

[aler9]

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[codecov]

Codecov Report

❌ Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.64%. Comparing base (42c77ce) to head (e8bbb18).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/codecs/h265/dts_extractor.go	95.12%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   83.12%   83.64%   +0.51%     
==========================================
  Files          87       87              
  Lines        7540     7552      +12     
==========================================
+ Hits         6268     6317      +49     
+ Misses        953      927      -26     
+ Partials      319      308      -11     

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