test: remove common.PORT from test-tlswrap

`test/async-hooks/test/test-tlswrap.js` uses `common.PORT` but
async-hooks tests are run in parallel. Another test using port 0 could
result in a port collision. Remove `common.PORT` from the test.

PR-URL: nodejs/node#15742
Ref: nodejs/node#14404 (comment)
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/async-hooks/test-tlswrap.js

@@ -25,15 +25,15 @@ const server = tls
   })
   .on('listening', common.mustCall(onlistening))
   .on('secureConnection', common.mustCall(onsecureConnection))
-  .listen(common.PORT);
+  .listen(0);
 
 let svr, client;
 function onlistening() {
   //
   // Creating client and connecting it to server
   //
   tls
-    .connect(common.PORT, { rejectUnauthorized: false })
+    .connect(server.address().port, { rejectUnauthorized: false })
     .on('secureConnect', common.mustCall(onsecureConnect));
 
   const as = hooks.activitiesOfTypes('TLSWRAP');