gst/gstpadtemplate.c: The old behaviour was that gst_pad_template_new() takes ownership of the caps. As we now call g...

Original commit message from CVS:
* gst/gstpadtemplate.c:
The old behaviour was that gst_pad_template_new() takes ownership of
the caps. As we now call g_object_new() which calls g_object_set() and
which copies the caps, we have to unref them to not leak them. Fixes
make valgrid for me.