Fix launch animation for PrivacyDialog and reenable dismiss anim

This CL addresses two problems:
1. The dialog launch animation bounds are fixed
2. The dialog exit animation is reenabled when the chip is still visible

Bug: 291063218
Flag: NONE
Test: atest PrivacyDialogControllerV2Test, Manual, i.e. testing dialog animations on device and analysing frames in screen recording
Change-Id: I5b838b3db342e9d7cd6c911d37375ca7a1e502da