multimedia/obs-studio: Adjust patches and fix build with FFmpeg 6

Adjust patches to use merged commits with upstream and
2e79d4c902abf3e6bb4ad1b5bf779c0cc22a6fd0 to fix build with FFmpeg 6

References:
https://github.com/obsproject/obs-studio/commit/2e79d4c902abf3e6bb4ad1b5bf779c0cc22a6fd0

PR: 270968
Reviewed by: yuri (maintainer)