mpv: use ffmpeg-full when using youtubeSupport
mpv: use ffmpeg-full when using youtubeSupport

We need networking and potentially ssl/tls compiled into ffmpeg but the
minimal ffmpeg_x wrappers no longer offer that. We could of course use
ffmpeg-full and slim it down to just what we need but we'd end up
building ffmpeg twice, might as well stick with full

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