when ingress-nginx is deployes without a class, we need to use 'ingress-controller-leader' resource instead of the default 'ingress-controller-leader-nginx' (#9156)

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

@@ -32,7 +32,7 @@ rules:
     # Here: "<ingress-controller-leader>-<nginx>"
     # This has to be adapted if you change either parameter
     # when launching the nginx-ingress-controller.
-    resourceNames: ["ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"]
+    resourceNames: [{% if ingress_class is defined %}"ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"{% else %}"ingress-controller-leader"{% endif %}]
     verbs: ["get", "update"]
   - apiGroups: ["coordination.k8s.io"]
     resources: ["leases"]
@@ -40,7 +40,7 @@ rules:
     # Here: "<ingress-controller-leader>-<nginx>"
     # This has to be adapted if you change either parameter
     # when launching the nginx-ingress-controller.
-    resourceNames: ["ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"]
+    resourceNames: [{% if ingress_class is defined %}"ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"{% else %}"ingress-controller-leader"{% endif %}]
     verbs: ["get", "update"]
   - apiGroups: [""]
     resources: ["configmaps"]
@@ -58,7 +58,7 @@ rules:
     # Here: "<ingress-controller-leader>-<nginx>"
     # This has to be adapted if you change either parameter
     # when launching the nginx-ingress-controller.
-    resourceNames: ["ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"]
+    resourceNames: [{% if ingress_class is defined %}"ingress-controller-leader-{{ ingress_nginx_class | default('nginx') }}"{% else %}"ingress-controller-leader"{% endif %}]
     verbs: ["get", "update"]
   - apiGroups: ["coordination.k8s.io"]
     resources: ["leases"]