fix(nuxt): fix typo on nitro.autoImport option

[antfu]

🔗 Linked issue

Nitro PR: unjs/nitro#1297

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

autoImports was never a thing, the typecheck on the options might be broken.

unjs/nitro#1297 introduced the autoImport option from unimport and we should forward the option to it.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.