SystemUI: Fix wrong method to identify cutout position

- When the cutout is on the right side of the screen, the position of the right bound
  of the cutout rectangle should be compared to the screen width, not to the height.
- Google sneakily fixed it in the following commit of android-13.0.0_r16
  0ab0199c
- Now, for devices with cutout on the right side of screen, no useless space area
  will be generated in the middle of the status bar.

Test:
1. Settings -> System -> Developer options
2. Select "Corner cutout" in "Display cutout"
3. Enable "Show layout bounds"
4. Check for space area between the notification icons area on the left side and
   the system icons area on the right side that shouldn't be there.

Change-Id: I75632aed20a9e31fd82dd7562c718e4c567dd9f3