Notification settings updates

- smaller icons
- text update
- fx header
- fix category header

Test: make -j RunSettingsRoboTests

Change-Id: If822d6db31a8dccf20ee88182cda1aee34aa7675
Fixes: 77325154
Fixes: 77323406
Fixes: 77324677
Fixes: 74408368

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

@@ -57,7 +57,7 @@ public class BadgePreferenceController extends NotificationPreferenceController
             return false;
         }
         if (mChannel != null) {
-            if (NotificationChannel.DEFAULT_CHANNEL_ID.equals(mChannel.getId())) {
+            if (isDefaultChannel()) {
                 return true;
             } else {
                 return mAppRow.showBadge;