demux_lavf: always give libavformat the filename when probing

This gives the filename or URL to the libavformat probing logic, which
might use the file extension as a "help" to decide which format the file
is. This helps with mp3 files that have large id3v2 tags and prevents
the idiotic ffmpeg probing logic to think that a mp3 file is amr.

(What we really want is knowing whether we _really_ need to feed more
data to libavformat to detect the format. And without having to pre-read
excessive amounts of data for relatively normal streams.)

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