addons: Update nginx-ingress to 0.9.0-beta.19

* Undo rollback f00ecde854
* Port binding regression only occurs with --enable-ssl-passthrough,
which isn't used in these examples. See
https://github.com/kubernetes/ingress-nginx/issues/1788

addons/nginx-ingress/google-cloud/deployment.yaml

@@ -19,7 +19,7 @@ spec:
       hostNetwork: true
       containers:
         - name: nginx-ingress-controller
-          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.9.0-beta.17
+          image: quay.io/kubernetes-ingress-controller/nginx-ingress-controller:0.9.0-beta.19
           args:
             - /nginx-ingress-controller
             - --default-backend-service=$(POD_NAMESPACE)/default-backend