add topic to flaskbb_form_new_topic_save call

flaskbb/forum/forms.py

@@ -75,7 +75,8 @@ class NewTopicForm(ReplyForm):
         if self.track_topic.data:
             user.track_topic(topic)
 
-        current_app.pluggy.hook.flaskbb_form_new_topic_save(form=self)
+        current_app.pluggy.hook.flaskbb_form_new_topic_save(form=self,
+                                                            topic=topic)
         return topic.save(user=user, forum=forum, post=post)