Add missing ending parenthesis

[ahcarpenter]

This PR is to add the missing ending parenthesis to:

server.ext("onPreResponse", (request, reply) => {
  const query = qs.stringify(request.query);
  const currentLocation = request.path + (query.length ? "?" + query : "");
  const cookies = request.headers.cookies;

  renderApp({
    isServer: true,
    cookies,
    currentLocation
  }).then(appComponent => {
    reply(getMarkup(appComponent));
  });
});