Fix layout for iPads running iOS 13.0

[ShivamArora]

When running the QRCode Scanner on iPads running iOS 13.0, the cancel button isn't visible.

Also, the scanner opens up as a pop-up rather than a full-screen scanner.

[johanhenselmans]

Has that been fixed with #53? I cannot check it as I do not have a IOS 13 device.

[ShivamArora]

Nope. That just fixed the layout for iPhone and not for iPads.

And also, the button position messes up when the orientation changes.