Fix race condition between app launch animation and shade expansion

Whenever an app is launched from shade, ActivityTransitionAnimator#onTransitionAnimationStart sets blursDisabledForAppLaunch to true
This is reset to false when ActivityTransitionAnimator#onTransitionAnimationEnd is invoked.

When ActivityTransitionAnimator#onTransitionAnimationEnd is invoked before shadeExpansion becomes 0, a non-zero blur radius is computed and applied, this causes a one frame flicker when we launch an app from shade on an unlocked device.

Flag: com.android.systemui.bouncer_ui_revamp
Test: verified manually
Bug: 396054791
Change-Id: I35e33fc0200e9cd176fc9c622e826dd8765d2e2e