test: use dynamic port in test-dgram-send-address-types

Remove common.PORT from test-dgram-send-address-types to eliminate
possibility that a dynamic port used in another test will collide
with common.PORT.

PR-URL: https://github.com/nodejs/node/pull/13007
Refs: https://github.com/nodejs/node/issues/12376


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>