demux_mkv: enable codec parsing for vfw-muxed files too

For some codecs, we need to invoke a codec parser (because libavcodec
will run into trouble otherwise). This was done based on the Matroska
codec field.

But this ignores handling of vfw-muxed files, which use a pseudo-codec
to signal presence of vfw structures, which we must unmangle to get the
real codec. Handle this by rearranging the code.

This fixes at least mp3-in-mkv for vfw-muxed files; typically old files.

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