test: remove setTimeout in test-net-connect-unref

Removes the setTimeout since if the test were to fail it would time out
due to the tools/test.py wrapper

PR-URL: https://github.com/nodejs/node/pull/21969
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

test/internet/test-net-connect-unref.js

@@ -23,12 +23,8 @@
 const common = require('../common');
 const net = require('net');
 
-const TIMEOUT = 10 * 1000;
-
 const client = net.createConnection(53, '8.8.8.8', function() {
   client.unref();
 });
 
 client.on('close', common.mustNotCall());
-
-setTimeout(common.mustNotCall(), TIMEOUT).unref();