[statusbar] Use the right settings observer

Not sure why there are two of them -- but if there are two of them then
we should be using the one that responds to SHOW_NOTIFICATIONS events.

Change-Id: Ibe0100bc767fbbad41494c6ddada07590942136c

packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

@@ -309,6 +309,7 @@ public abstract class BaseStatusBar extends SystemUI implements
             mUsersAllowingPrivateNotifications.clear();
             mUsersAllowingNotifications.clear();
             // ... and refresh all the notifications
+            updateLockscreenNotificationSetting();
             updateNotifications();
         }
     };
@@ -714,7 +715,7 @@ public abstract class BaseStatusBar extends SystemUI implements
                 mSettingsObserver);
         mContext.getContentResolver().registerContentObserver(
                 Settings.Secure.getUriFor(Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS), false,
-                mSettingsObserver,
+                mLockscreenSettingsObserver,
                 UserHandle.USER_ALL);
         if (ENABLE_LOCK_SCREEN_ALLOW_REMOTE_INPUT) {
             mContext.getContentResolver().registerContentObserver(