Change default guild IDs attribute to persist on copy

discord/app_commands/tree.py

@@ -65,7 +65,7 @@ def _retrieve_guild_ids(
         # If no arguments are given then it should default to the ones
         # given to the guilds(...) decorator or None for global.
         if guild is MISSING:
-            return getattr(command, '__discord_app_commands_default_guilds__', None)
+            return getattr(command, '_guild_ids', None)
 
         # guilds=[] is the same as global
         if len(guilds) == 0: