fix failuredomain on mp

Signed-off-by: sivchari <shibuuuu5@gmail.com>

Author: sivchari

test/e2e/data/infrastructure-docker/main/bases/cluster-with-topology.yaml

@@ -68,7 +68,7 @@ spec:
         minReadySeconds: 5
         replicas: ${WORKER_MACHINE_COUNT}
         failureDomains:
-          - name: fd4
+          - fd4
     variables:
       # We set an empty value to use the default tag kubeadm init is using.
     - name: etcdImageTag