FIX: update topic fancy title when updating category name

app/models/category.rb

@@ -463,7 +463,7 @@ SQL
     old_name = changed_attributes["name"]
     return unless topic.present?
     if topic.title == I18n.t("category.topic_prefix", category: old_name)
-      topic.update_column(:title, I18n.t("category.topic_prefix", category: name))
+      topic.update_attribute(:title, I18n.t("category.topic_prefix", category: name))
     end
   end
 

spec/models/category_spec.rb

@@ -310,6 +310,7 @@ describe Category do
       @category.update_attributes(name: 'Troutfishing')
       @topic.reload
       expect(@topic.title).to match(/Troutfishing/)
+      expect(@topic.fancy_title).to match(/Troutfishing/)
     end
 
     it "doesn't raise an error if there is no definition topic to rename (uncategorized)" do