Remove workaround for v1.25.0 ConfigMap rendering issue

* LocalStorageCapacityIsolationFSQuotaMonitoring was reverted back to
alpha in v1.25.1, so we don't need to explicitly disable it anymore

Rel: https://github.com/kubernetes/kubernetes/issues/112081

google-cloud/flatcar-linux/kubernetes/workers/butane/worker.yaml

@@ -113,8 +113,6 @@ storage:
             - ${cluster_dns_service_ip}
           clusterDomain: ${cluster_domain_suffix}
           healthzPort: 0
-          featureGates:
-            LocalStorageCapacityIsolationFSQuotaMonitoring: false
           rotateCertificates: true
           staticPodPath: /etc/kubernetes/manifests
           readOnlyPort: 0