Secure => global bubble settings pt 1

Follow up to http://ag/8222583, which enables bubbles globally instead
of at the per-user level
- Remove user-specific tracking
- Remove Secure.NOTIFICATION_BUBBLES from backup
- Replace references to Secure.NOTIFICATION_BUBBLES with
Global.NOTIFICATION_BUBBLES
- Update tests

Fixes: 136034310
Bug: 129158983
Test: m RunSettingsRoboTests
Test: atest SystemUITests
Test: manual - work profile bubbles show up
Change-Id: I931f8f2640ac01fdf4c30ef9f9474fde7ca2d262
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java b/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
index b5bc413..4bb6ed4 100644
--- a/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
+++ b/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java
@@ -421,7 +421,7 @@
     private void setUpPrefsForBubbles(boolean globalEnabled, boolean pkgEnabled,
             boolean channelEnabled) {
         mService.setPreferencesHelper(mPreferencesHelper);
-        when(mPreferencesHelper.bubblesEnabled(any())).thenReturn(globalEnabled);
+        when(mPreferencesHelper.bubblesEnabled()).thenReturn(globalEnabled);
         when(mPreferencesHelper.areBubblesAllowed(anyString(), anyInt())).thenReturn(pkgEnabled);
         when(mPreferencesHelper.getNotificationChannel(
                 anyString(), anyInt(), anyString(), anyBoolean())).thenReturn(