Display Cutout: invalidate overlay view when cutout changes

Fixes an issue where the emulation overlay did not
properly update when changing the cutout to a similarly
sized cutout.

Change-Id: Ie29829c08185b97b40c87b772fec452a01c0ef3a
Fixes: 74404788
Test: Select Narrow display cutout, then select Wide or Double cutout. Verify that the cutout properly changes.