triage links to batch PR test runs are broken

[BenTheElder]

see e.g. https://storage.googleapis.com/k8s-triage/index.html?pr=1&job=gce&test=%5EUp&xjob=kops%7Ccanary

generates a link like: https://prow.k8s.io/view/gs/kubernetes-ci-logs/pr-logs/pull/batch/pull-kubernetes-e2e-gce/1971247749483466752

which does not work / has no results

[k8s-ci-robot]

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