vaapisink: when updating the caps, reset rotation
When an element upstream changes settings (e.g. crop), new caps are sent to vaapisink. When vaapisink was rotating the image, it needs to re-evaluate if the sink needs to rotate the image.
When an element upstream changes settings (e.g. crop), new caps are sent to vaapisink. When vaapisink was rotating the image, it needs to re-evaluate if the sink needs to rotate the image.