Misc bouncer fixes

- IME flickers after dismissing a call
- IME not being triggered after rebooting
- Bouncer being shown during shade expansion animation

Test: go/sysui-bouncer-tests
Test: atest packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/KeyguardBouncerTest.java
Fixes: 74523176
Fixes: 75001274
Change-Id: Iae2aa1534c34a4191311b85e81e80cea89711bf4