Fix events.Raw not having ._set_client

telethon/telegram_client.py

@@ -2505,7 +2505,11 @@ class TelegramClient(TelegramBareClient):
         for builder, callback in self._event_builders:
             event = builder.build(update)
             if event:
+                if hasattr(event, '_set_client'):
                     event._set_client(self)
+                else:
+                    event._client = self
+
                 event.original_update = update
                 try:
                     callback(event)