Map the Vorbis DESCRIPTION, ORGANIZATION and PUBLISHER fields

[MildlyMeticulous]

FFmpeg writes the comment and publisher fields into Vorbis comments as DESCRIPTION and PUBLISHER, neither of which is mapped, so both are dropped from common:

wide.flac   DESCRIPTION=Wide Comment   PUBLISHER=Wide Label
            common.comment  undefined
            common.label    undefined

DESCRIPTION and ORGANIZATION are both in the Ogg Vorbis comment field recommendations. PUBLISHER is not, but it is what FFmpeg writes, and track:PUBLISHER is already mapped to label in MatroskaTagMapper.

Vorbis	common
DESCRIPTION	comment
ORGANIZATION	label
PUBLISHER	label

Added a 4.8 kB test/samples/ogg/vorbis-description.ogg. 587 passing; reverting VorbisTagMapper.ts fails the new test.