gst/id3demux/id3tags.c: Extract frames for ID3v2 versions prior to ID3v2.3.0 properly as well, and add the version to...

Original commit message from CVS:
* gst/id3demux/id3tags.c:
(id3demux_add_id3v2_frame_blob_to_taglist):
Extract frames for ID3v2 versions prior to ID3v2.3.0 properly as
well, and add the version to the blob's buffer caps, since that
information will be needed for deserialisation later on (#348644).