[RESTRICT AUTOMERGE] AccessibilityManagerService: remove uninstalled services from enabled list after service update. am: 766911c331

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26709088

Change-Id: I019d558fe0751ef221c77616ffa0d1f58973a138
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>