multimedia/ffmpeg4: Update 4.4.7 => 4.4.8

Changelog:
https://git.ffmpeg.org/gitweb/ffmpeg.git/blob_plain/n4.4.8:/Changelog
https://github.com/FFmpeg/FFmpeg/blob/n4.4.8/Changelog

While here replace spaces with tabs.

PR: 298492
Sponsored by: UNIS Labs (vvd, commit patch)
MFH: 2026Q3