🐛 Bug: Prioritize existing author email over running npm user's

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

Running npx create-typescript-app on a repo should not change the package.json file's author.email if it exists.

Actual

https://github.com/JoshuaKGoldberg/package-json-validator/pull/178/files#diff-7ae45ad102eab3b6d7e7896acd08c427a9b25b346470d7bc6507b6481575d519R16 shows that the opposite preference order is used. My npm email was used instead of the existing one.

Additional Info

🎁

[github-actions]

🎉 This is included in version v2.22.10 🎉

The release is available on:

• GitHub releases
• npm package (@latest dist-tag)

Cheers! 📦🚀