Correct path to task queues sample. (GoogleCloudPlatform#2444)

Author: dzlier-gcp

appengine-java8/taskqueues-push/src/main/java/com/example/appengine/taskqueue/push/Enqueue.java

@@ -44,7 +44,7 @@ protected void doPost(HttpServletRequest request, HttpServletResponse response)
     // Add the task to the default queue.
     // [START addQueue]
     Queue queue = QueueFactory.getDefaultQueue();
-    queue.add(TaskOptions.Builder.withUrl("/worker").param("key", key));
+    queue.add(TaskOptions.Builder.withUrl("/taskqueues/worker").param("key", key));
     // [END addQueue]
 
     response.sendRedirect("/");