fix: dsr1 recipe download pvc name (#4566)

Signed-off-by: hongkuanz <hongkuanz@nvidia.com>

Author: tedzhouhk

recipes/deepseek-r1/model-cache/model-download.yaml

@@ -34,4 +34,4 @@ spec:
       volumes:
       - name: model-cache
         persistentVolumeClaim:
-          claimName: model-cache-pvc
+          claimName: model-cache