vp9enc: Sink caps don't get restricted based on downstream `profile-id`
For gst-launch-1.0 videotestsrc num-buffers=50 ! video/x-raw, format=Y444 ! vp9enc ! video/x-vp9, profile-id=0 ! webmmux ! filesink location=output.webm
the pipeline runs fine and the format for output.webm
is Y444 while profile-id=0
should be limited to I420
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