fix: don't use file url when building prerenderer

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#13801, resolves

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When prerendering, we don't want to use the source dist/server file, which still references virtual modules and other aliases. Instead, we want to inline it.

📝 Checklist

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