demux_lavf: drop jpeg frames that are at a nonzero posHEADmaster

There are jpg files out there that have extra embedded metadata
(pictures from smartphones commonly have an embedded gain map). ffmpeg
doesn't currently support this, so mpv currently sees the extra metadata
as essentially another frame. This results in weird video-like behavior.
Until ffmpeg support this more properly, we can work around this by
simply discarding extra packets and not sending the new frame to the
internal playloop. If demux_lavf detects that the stream is a
single-frame jpg, then we only accepts the packet at pos 0. Anything
else is discarded. Ref #13192.

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