Only schedule a reminder if it's an alerting notification.

// FREEBIE

src/org/thoughtcrime/securesms/notifications/MessageNotifier.java

@@ -174,7 +174,10 @@ public class MessageNotifier {
       }
 
       updateBadge(context, notificationState.getMessageCount());
-      scheduleReminder(context, reminderCount);
+
+      if (signal) {
+        scheduleReminder(context, reminderCount);
+      }
     } finally {
       if (telcoCursor != null) telcoCursor.close();
       if (pushCursor != null)  pushCursor.close();