Update message type in prefetch-on-demand controller (#176)

The message type in the workbox.messageSW function call was updated from "PREFETCH" to "CACHE_URLS". Additionally, the payload property name was changed from "urls" to "urlsToCache" to reflect the latest method call changes.

assets/src/prefetch-on-demand_controller.js

@@ -11,9 +11,9 @@ export default class extends Controller {
         }
 
         workbox.messageSW({
-            "type": "PREFETCH",
+            "type": "CACHE_URLS",
             "payload": {
-                "urls": params.urls
+                "urlsToCache": params.urls
             }
         });
     }