ytdl_hook: try to skip interleaved streams with all_formats

If a "format" has both audio and video codec set, it might contain both
audio and video. all_format assumes that each format is just a quality
variant containing a single track.

This seems to happen with sites that provide a HLS master URL.
youtube-dl tends to "butcher" it, and the result isn't very ideal. I
guess HLS "renditions" simply don't map well to youtube-dl's output
format and what mpv expects. Playing master HLS directly is also less
than ideal, because of libavformat's stupid probing.

Fix this by not using the delay-opening mechanism if it appears like we
detected such a case. Add a metadata override to set the track titles to
"muxed-N", to indicate that they form a single unit. (Mostly helpful for
testing.)

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