Defer onIsStashedChanged() until all controllers are initialized am: aed0c4d73e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17921731

Change-Id: I6690774f541eaedb7c5d0d8436e618cfb3af791d
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>