Update script-weatherNode.js to fetch and display weather for default…

… city on page load and for user-input city on button click.

weather-node/public/script-weatherNode.js

@@ -1,5 +1,5 @@
 function fetchWeather(city) {
-    fetch('/weather?city=${city}')
+    fetch(`/weather?city=${city}`)
     .then(response => response.json())
     .then(data => {
         const weatherDiv = document.getElementById('Weather');