iPad/Mac without MobileGestalt should use "iPad" Mobile UA, not "iPhone"
<rdar://problem/109290803>
Pull request: https://github.com/WebKit/WebKit/pull/14497
Committed 264688@main (933e2a5f0110): <https://commits.webkit.org/264688@main> Reviewed commits have been landed. Closing PR #14497 and removing active labels.