url: add ws: and wss: to slashedProtocol set

Fix cases where the pathname is incorrectly parsed as `null`.

PR-URL: https://github.com/nodejs/node/pull/26941


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>