test: use dynamic port in test-cluster-bind-twice

Remove common.PORT from test-cluster-bind-twice to eliminate possibility
that a dynamic port used in another test will collide with common.PORT.

PR-URL: https://github.com/nodejs/node/pull/12418
Ref: https://github.com/nodejs/node/issues/12376


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>