refactor: remove unused line

In Socket.IO v2, the Socket `query` option was sent when connecting to
a custom namespace (but not for the main namespace).

This was fixed in Socket.IO v3 ([1]), so this line is now useless.

[1]: https://socket.io/docs/v3/migrating-from-2-x-to-3-0/#Add-a-clear-distinction-between-the-Manager-query-option-and-the-Socket-query-option