Updating ACCESSIBILITY_QS_TARGETS when user moves the A11y QS tiles in the QS Panel

Bug: 314843909

Test: manual (add/remove a11y tile in QS panel and check if the qs
shortcut option is selected/deselected in the Settings app if the tile
is not associated to an a11y feature that requires the user to grant
full device control permission)
Test: atest AccessibilityManagerServiceTest
Test: atest AccessibilityUserStateTest

Flag: ACONFIG android.view.accessibility.a11y_qs_shortcut
Change-Id: I92dba0a1d0581f926d17fcf2693129dcf80d89a8