multimedia/mpv: unbreak audio with YTDLP=on after 35a7667ec445

[ytdl_hook] EDL doesn't support fragmentswithout duration with MP4 DASH
EDL specifies no segments.'
EDL parsing failed.
Error in EDL.
EDL: source file 'edl://!mp4_dash,init=%910%https://...' has unknown duration.

PR: 270437