fix(nuxt): normalize string transpile paths for windows

[danielroe]

🔗 Linked issue

resolvesnuxt/nuxt#14084

❓ 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

This normalises any string transpiles added by modules/user (particularly relevant for Windows support).

📝 Checklist

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

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[pi0]

Note for the future: We might find a way that untyped schema normalization can handle the modifications. But probably longer term goal when we had proxy.