Revert "Secure => global bubble settings pt 2"

This reverts commit a978ab4526.

Reason for revert: fix test

Change-Id: Id6b49106ab7d8a42ea5de8b16a0dd3ed49d58817

src/com/android/settings/notification/GlobalBubblePermissionObserverMixin.java

@@ -47,8 +47,8 @@ public class GlobalBubblePermissionObserverMixin extends ContentObserver {
 
     public void onStart() {
         mContext.getContentResolver().registerContentObserver(
-                Settings.Global.getUriFor(
-                        Settings.Global.NOTIFICATION_BUBBLES),
+                Settings.Secure.getUriFor(
+                        Settings.Secure.NOTIFICATION_BUBBLES),
                 false /* notifyForDescendants */,
                 this /* observer */);
     }