fix(android): fix for onNewToken not being called

Author: farfromrefug

plugin/platforms/android/java/com/nativescript/push/PushMessagingService.java

@@ -65,6 +65,7 @@ public void onComplete(Task<InstanceIdResult> task) {
           callback.error(task.getException());
         } else {
           final String token = task.getResult().getToken();
+          executeOnPushTokenReceivedCallback(token);
           callback.success(token);
         }
       }