fix: fixed ws disconnected state on connection end

[Sadzurami]

Since events are ignored https://github.com/DoctorMcKay/node-steam-user/blob/686d773f88df373ed0e7be845a37c46dd081d9b1/components/connection_protocols/websocket.js#L98-L102

We can't catch disconnected event later, so disconnected state is not properly updated.