Use hasSentValidBubble in settings

This change makes it such that bubble settings will only be available once
the app has sent a bubble notification.

Test: atest BubbleSummaryPreferenceControllerTest
Bug: 178387292
Change-Id: I459ffcedc4194d953e8b7170937e2eb5334d1422

src/com/android/settings/notification/app/BubbleSummaryPreferenceController.java

@@ -63,7 +63,7 @@ public class BubbleSummaryPreferenceController extends NotificationPreferenceCon
                 return mAppRow != null;
             }
         }
-        return isGloballyEnabled() && mBackend.hasSentValidMsg(mAppRow.pkg, mAppRow.uid);
+        return isGloballyEnabled() && mBackend.hasSentValidBubble(mAppRow.pkg, mAppRow.uid);
     }
 
     @Override