Turn off the Always-on a11y service with correct user id

Bug: 345134377
Test: manually
- Setup AccessibilityMenu FAB shortcut for OWNER USER
- Switch to Guest USER
- Setup AccessibilityMenu FAB shortcut and remove the shortcut
- Switch back to OWENR USER
- Wait until the AccessibilityManagerService finish switch the user
- Verify the FAB showed up on the screen
Test: atest ShortcutUtilsTest
Flag: EXEMPT bugfix low risk

Change-Id: If2cc5c4742a32256631d4cf05dc6eab9649a410a