test(ui): repoint page-render-smoke from /app/nodes to /app/cluster

The /app/nodes route now redirects to the merged Cluster page, so the
render-smoke spec (added on master) asserted a stale URL. Point it at
/app/cluster, which keeps render-smoke coverage on the new page.

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f