Make "load more" in forums not appear incorrectly

The rendering of the link happens in an event handler, and the
collection's attributes were not getting set properly before the reset
event triggering the rendering occurred.

Originally reviewed in #4072

common/static/coffee/src/discussion/discussion.coffee

@@ -62,9 +62,9 @@ if Backbone?
           new_threads = [new Thread(data) for data in response.discussion_data][0]
           new_collection = _.union(models, new_threads)
           Content.loadContentInfos(response.annotated_content_info)
-          @reset new_collection
           @pages = response.num_pages
           @current_page = response.page
+          @reset new_collection
         error: error
 
     sortByDate: (thread) ->