[RESTRICT AUTOMERGE] AccessibilityManagerService: remove uninstalled services from enabled list after service update. am: 5405514a23

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26708954

Change-Id: I0cca3ae1e4ed76e0bf8817ebaf2b125fcda55d4a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>