Notification settings updates

- Footer preferences were too dim
- Fix text and target on recently sent apps
- Make 'behavior' a dialog
- reorder settings on apps page

Change-Id: Idf8056bc77ead89fe2025bbde3346861e23a3c8d
Fixes: 72652526
Fixes: 72651810
Fixes: 72652024
Bug: 72651953
Test: make RunSettingsRoboTests

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

@@ -55,7 +55,6 @@ public class DeletedChannelsPreferenceController extends NotificationPreferenceC
             preference.setTitle(mContext.getResources().getQuantityString(
                     R.plurals.deleted_channels, deletedChannelCount, deletedChannelCount));
         }
-        preference.setEnabled(false);
         preference.setSelectable(false);
     }
 }