h264: support frame_mbs_only_flag = 0

[aler9]

Related to bluenviron/mediamtx#2259

[codecov]

Codecov Report

Merging #68 (e88b795) into main (fbd08b7) will decrease coverage by 0.12%.
Report is 1 commits behind head on main.
The diff coverage is 77.58%.

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   83.73%   83.61%   -0.12%     
==========================================
  Files          56       56              
  Lines        4826     4870      +44     
==========================================
+ Hits         4041     4072      +31     
- Misses        572      584      +12     
- Partials      213      214       +1     

Files Changed	Coverage Δ
pkg/codecs/h264/idr_present.go	100.00% <ø> (ø)
pkg/codecs/h264/sps.go	96.62% <77.19%> (-2.73%)	⬇️
pkg/codecs/h264/dts_extractor.go	85.81% <100.00%> (-0.30%)	⬇️

... and 1 file with indirect coverage changes

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