nginx ingress: fix yaml for multiple nodeselectors (#6768)

In case multiple nodeselectors are specified in ingress_nginx_nodeselector, the generated daemonset yaml template for nginx is invalid due to missing indentation starting with the second nodeselector

roles/kubernetes-apps/ingress_controller/ingress_nginx/templates/ds-ingress-nginx-controller.yml.j2

@@ -28,7 +28,7 @@ spec:
 {% endif %}
 {% if ingress_nginx_nodeselector %}
       nodeSelector:
-        {{ ingress_nginx_nodeselector | to_nice_yaml }}
+        {{ ingress_nginx_nodeselector | to_nice_yaml | indent(width=8) }}
 {%- endif %}
 {% if ingress_nginx_tolerations %}
       tolerations: