metropolis/cli/metroctl: Add missing role to command error message

Change-Id: I06530fcc296022c5d24aee396073f6ce20d41135
Reviewed-on: https://review.monogon.dev/c/monogon/+/3331
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/cli/metroctl/cmd_node_set.go b/metropolis/cli/metroctl/cmd_node_set.go
index 5d465f5..949f262 100644
--- a/metropolis/cli/metroctl/cmd_node_set.go
+++ b/metropolis/cli/metroctl/cmd_node_set.go
@@ -103,6 +103,7 @@
 				Id: node,
 			},
 		}
+
 		switch role {
 		case "kubernetescontroller", "kc":
 			req.KubernetesController = opt(false)
@@ -111,7 +112,7 @@
 		case "consensusmember", "cm":
 			req.ConsensusMember = opt(false)
 		default:
-			log.Fatalf("Unknown role: %s. Must be one of: KubernetesWorker, ConsensusMember.", role)
+			log.Fatalf("Unknown role: %s. Must be one of: KubernetesController, KubernetesWorker, ConsensusMember.", role)
 		}
 
 		_, err := mgmt.UpdateNodeRoles(ctx, req)