Remove overriding of template reply_to_text

The code that uses this object gets the reply to text from the
notification itself, not the template.

So I don’t think this overriding is used.

app/models/notification.py

@@ -44,9 +44,7 @@ class Notification(JSONModel):
 
     @classmethod
     def from_id_and_service_id(cls, id, service_id):
-        instance = cls(notification_api_client.get_notification(service_id, str(id)))
-        instance.template["reply_to_text"] = instance.reply_to_text
-        return instance
+        return cls(notification_api_client.get_notification(service_id, str(id)))
 
     @property
     def status(self):