fix(externals): check explicit inline rules on resolved id

[pi0]

🔗 Linked issue

reproduction with shiki/wasm: https://stackblitz.com/edit/unjs-nitro-starter-4aetky?file=server%2Froutes%2Findex.ts

❓ 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

Externals plugin used to only check against original id. If a resolved id is matching explicit inline patterns, it was not respected.

📝 Checklist

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