Fix a stage file path issue in demo

[yuanchen8911]

What type of PR is this?

/kind bug

What this PR does / why we need it:

This PR fixes a non-existing stage file path in the file stage-pod-general.demo.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Fix a broken stage file path in a demo.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[yuanchen8911]

/assign @wzshiming

[wzshiming]

Ah, now is unsupported use kustomization.yaml file as config, it will support in #1018

[yuanchen8911]

Any fix without the kcustomization support?

[k8s-triage-robot]

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