ext/dv/demo-play.c: xvideosink -> xvimagesink

ext/dv/demo-play.c: xvideosink -> xvimagesink

Original commit message from CVS:
* ext/dv/demo-play.c: (main):
xvideosink -> xvimagesink
* ext/dv/gstdvdec.c:
change rgb 32/32 caps to 24/32 (no alpha)
change nb of channels to be a list (2 or 4, not 2)
change sample rate to be a list (32, 44.1, 48 kHz) not a range
* gst/asfdemux/gstasfdemux.c:
(gst_asf_demux_process_ext_content_desc):
Add 'date/year' to extracted metadata list