test: fixing assertion value order

PR-URL: #23574
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Hitesh Kanwathirtha <digitalinfinity@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-net-stream.js

@@ -69,5 +69,5 @@ const server = net.createServer(function(socket) {
 });
 
 process.on('exit', function() {
-  assert.strictEqual(server.connections, 0);
+  assert.strictEqual(0, server.connections);
 });