Only block IOKit in sandbox if UI side compositing is enabled. The UI side compositing flag is currently not being checked.
<rdar://problem/108224554>
Pull request: https://github.com/WebKit/WebKit/pull/12940
Committed 263160@main (13feb81f311a): <https://commits.webkit.org/263160@main> Reviewed commits have been landed. Closing PR #12940 and removing active labels.