Pleroma.Emoji.Pack: fix gradient error

lib/pleroma/emoji/pack.ex: The tuple {:cwd, tmp_dir} on line 103 is expected to have type :cooked
| :keep_old_files
| :memory
| :verbose
| {:cwd, list(char())}
| {:file_filter, (record(:zip_file) -> boolean())}
| {:file_list, list(:file.name())} but it has type {:cwd, binary()}

lib/pleroma/emoji/pack.ex

@@ -100,7 +100,7 @@ def add_file(%Pack{} = pack, _, _, %Plug.Upload{content_type: "application/zip"}
         {:ok, _emoji_files} =
           :zip.unzip(
             to_charlist(file.path),
-            [{:file_list, Enum.map(emojies, & &1[:path])}, {:cwd, tmp_dir}]
+            [{:file_list, Enum.map(emojies, & &1[:path])}, {:cwd, String.to_charlist(tmp_dir)}]
           )
 
         {_, updated_pack} =