[visionOS] Fullscreen element doesn't lay out correctly with WKWebView's scale is not initially 1
radar://113650540
Pull request: https://github.com/WebKit/WebKit/pull/16574
Committed 266822@main (6f57d245d733): <https://commits.webkit.org/266822@main> Reviewed commits have been landed. Closing PR #16574 and removing active labels.