Update shelf screenshot UI entrance animation

Bug: 332410356
Bug: 329659738
Test: manual (visual animation change)
Flag: ACONFIG com.android.systemui.screenshot_shelf_ui DEVELOPMENT

Change-Id: If525186a81d896b8b3420f478045912e2a3771aa
Merged-In: If525186a81d896b8b3420f478045912e2a3771aa
5 files changed