chore(realtime): remove unused ack argument

Author: o-santi

src/realtime/src/realtime/channel.py

@@ -166,7 +166,6 @@ def __init__(
         socket: RealtimeClient,
         topic: str,
         params: RealtimeChannelOptions | None = None,
-        ack: bool = True,
     ) -> None:
         """
         Initialize the Channel object.