Change marker event listener to addEventListener (#1271)

Author: willum070

samples/event-simple/index.ts

@@ -36,7 +36,7 @@ async function initMap() {
     });
 
     // Zoom in when the marker is clicked.
-    marker.addListener('gmp-click', () => {
+    marker.addEventListener('gmp-click', () => {
         innerMap.setZoom(8);
         innerMap.setCenter(marker.position as google.maps.LatLng);
     });