[Cocoa] Extra transform left on video layer when UI-side compositing is disabled
<rdar://problem/108109357>
Pull request: https://github.com/WebKit/WebKit/pull/13224
Committed 263456@main (8a95a469c00c): <https://commits.webkit.org/263456@main> Reviewed commits have been landed. Closing PR #13224 and removing active labels.