DEV: Fix dev plugin reloading issue (#215)

plugin.rb

@@ -46,6 +46,7 @@ after_initialize do
     end
   end
 
+  reloadable_patch do |plugin|
     class ::Topic
       has_one :assignment, dependent: :destroy
     end
@@ -62,6 +63,7 @@ after_initialize do
             )", levels: alias_levels(user), user_id: user && user.id)
       }
     end
+  end
 
   frequency_field = PendingAssignsReminder::REMINDERS_FREQUENCY
   register_editable_user_custom_field frequency_field