Watch messages does not use filters as expected

[MHHukiewitz]

Using watch_messages() like so:

    async for message in session.watch_messages(
        start_date=time.time(),
        message_type=MessageType.post,
        content_types=["Executions", "amend"],
        channels="FISHNET_TEST_V1",
    ):

results in all messages being received from the current https://api2.aleph.im, without any filters applied beside the start_date filter.

[odesenfans]

That's problematic. I think that's an issue with the message websocket iirc.