Fix SELinux presubmit: add missing \

Add missing \ not to split the long command

Author: jsafrane

config/jobs/kubernetes/sig-storage/sig-storage-gce-config.yaml

@@ -262,7 +262,7 @@ presubmits:
               kubetest2 kops -v=6 --cloud-provider=gce --up --down --build --env=KOPS_FEATURE_FLAGS=SELinuxMount \
                 --build-kubernetes=true --target-build-arch=linux/amd64 \
                 --admin-access=0.0.0.0/0 \
-                --kubernetes-feature-gates=SELinuxMount
+                --kubernetes-feature-gates=SELinuxMount \
                 --kops-version-marker=https://storage.googleapis.com/k8s-staging-kops/kops/releases/markers/master/latest-ci.txt \
                 --create-args "--image='rhel-cloud/rhel-9-v20240815' --channel=alpha --networking=cilium --set=cluster.spec.containerd.selinuxEnabled=true --gce-service-account=default --set=spec.nodeProblemDetector.enabled=true --set=cluster.spec.cloudProvider.gce.useStartupScript=true" \
                 --test=kops \