chore: remove duplicate code

Author: allenporter

roborock/devices/v1_rpc_channel.py

@@ -160,7 +160,6 @@ def find_response(response_message: RoborockMessage) -> None:
                 else:
                     future.set_result(decoded.data)
 
-        message = self._payload_encoder(request_message)
         unsub = await self._channel.subscribe(find_response)
         try:
             await self._channel.publish(message)