Fix more dialyzer issues

Author: RichDom2185

lib/cadet_web/admin_controllers/admin_assets_controller.ex

@@ -41,7 +41,6 @@ defmodule CadetWeb.AdminAssetsController do
            filename
          ) do
       {:error, {status, message}} -> conn |> put_status(status) |> text(message)
-      resp -> render(conn, "show.json", resp: resp)
     end
   end