Update javascript/ql/src/experimental/Security/CWE-94/examples/ServerSideTemplateInjection.js

Co-authored-by: Erik Krogh Kristensen <erik-krogh@github.com>

Author: monkey-junkie

javascript/ql/src/experimental/Security/CWE-94/examples/ServerSideTemplateInjection.js

@@ -31,3 +31,5 @@ app.post('/', (request, response) => {
     var html = getHTML(input)
     response.send(html);
 })
+
+app.listen(port, () => { console.log(`server is listening on ${port}`) })