[Cloudflare One] Fix private app selector name

[grstnhbr]

Summary

Updates the Gateway network policy example in the self-hosted private application guide to use the current dashboard selector, Self-hosted Access App with Private Address, instead of the retired Access Private App label.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit c52ca63.

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