Revert "Support toggling Taskbar All Apps with 3P Launcher." am: 036a83cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/26720630



Change-Id: I235f6d6263be6e39a583ac7b1a0783bfc77533c9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>