iOS: Keep QIOSBackingStore's paint device size in sync with the window

Treating the paint-device as a thing wrapper around the OpenGL paint engine
failed when the window was resized, as the paint engine would clip the
drawing to the old size. We need to update the size in beginPaint.

QBackingStore resize still behaves like before, and we emit a warning if
the user tries to resize the backing-store to some other size than the
window size, as that's not a supported use-case for our iOS backing store.

Change-Id: I1a0eeb65fa9db8b5538dc69963d6fc84be6e63f1
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

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