Avoid showing bouncer when in a launch transition

The panel will collapse but the bouncer should not become visible,
otherwise the IME might be requested.

Test: go/sysui-bouncer-tests
Test: atest packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManagerTest.java
Change-Id: I0405cf1b956aa239b0684ac357a38cf4b2357cb2
Fixes: 109879604