test: allow inspector to reopen with same port

Test checks that if you open the inspector with '0' (pick a random free
port), close it, then reopen it, you get a different port. However this
isn't necessarily true.

PR-URL: #14320
Fixes: #14316
Refs: #14316 (comment)
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>

Author: gibfahn

test/parallel/test-inspector-open.js

@@ -68,7 +68,6 @@ function tryToCloseWhenClosed(msg) {
 function reopenAfterClose(msg) {
   assert.strictEqual(msg.cmd, 'url');
   const port = url.parse(msg.url).port;
-  assert.notStrictEqual(port, firstPort);
   ping(port, (err) => {
     assert.ifError(err);
     process.exit();