iOS: Decouple screen geometry calculations from UIWindow geometry

At startup or when a new UIWindow has been created but not associated
with a UIScreen yet, its geometry will be invalid, and cause the wrong
geometry for its corresponding QScreen when we use it to map geometry.

Instead we explicitly use the status bar orientation to map to the
correct geometry.

Change-Id: If37b3ab2ad5db65e20a7e3af5c3854b3e3ddff0d
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@theqtcompany.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

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