refactor: rm unused warning

Author: mydearxym

lib/groupher_server_web/resolvers/cms_resolver.ex

@@ -214,10 +214,6 @@ defmodule GroupherServerWeb.Resolvers.CMS do
     CMS.set_tag(thread, %Tag{id: tag_id}, id)
   end
 
-  def set_refined_tag(_root, ~m(community_id thread id)a, _info) do
-    CMS.set_refined_tag(%Community{id: community_id}, thread, id)
-  end
-
   def unset_tag(_root, ~m(id thread tag_id)a, _info) do
     CMS.unset_tag(thread, %Tag{id: tag_id}, id)
   end