g/: Revert earlier commit defaulting to autovideosink because the sync-state bug is still there, breaking Totem.

Original commit message from CVS:
* gconf/gstreamer.schemas.in:
* gst-libs/gst/gconf/gconf.c: (gst_gconf_get_default_video_sink):
Revert earlier commit defaulting to autovideosink because the
sync-state bug is still there, breaking Totem.