Clarify notification blocking in notification app list.

Change summary to: Normal (nothing blocked), Partially blocked
(at least one topic blocked), or Totally blocked (entire app
blocked).

Allow filtering on apps that are partially or totally blocked.

Bug: 26882239
Change-Id: I29924147a97a3d1693b0286d48905485e11edf1d

src/com/android/settings/applications/AppStateNotificationBridge.java

@@ -63,7 +63,11 @@ public class AppStateNotificationBridge extends AppStateBaseBridge {
 
         @Override
         public boolean filterApp(AppEntry info) {
-            return info.extraInfo != null && ((AppRow) info.extraInfo).banned;
+            if (info == null) {
+                return false;
+            }
+            AppRow row = (AppRow) info.extraInfo;
+            return row.banned || row.bannedTopics;
         }
     };
 }