ext/vorbis/vorbisdec.c: Post tag messages on the bus even if we're not initialized.

ext/vorbis/vorbisdec.c: Post tag messages on the bus even if we're not initialized.

Original commit message from CVS:
* ext/vorbis/vorbisdec.c: (gst_vorbis_dec_reset),
(vorbis_dec_sink_event), (vorbis_handle_comment_packet),
(vorbis_handle_type_packet):
Post tag messages on the bus even if we're not initialized.
If we're not initialized, we still postpone the event pushing of tags.