fix: match signature for nitro/nuxt `useRuntimeConfig`composables

[wattanx]

🔗 Linked issue

Fixes: https://github.com/nuxt/bridge/issues/1229

❓ Type of change

• [ ] 📖 Documentation (updates to the documentation or readme)
• [x] 🐞 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 is caused by a mismatch in the sigunature of useRuntimeConfig in Nitro and Nuxt. This is the same way as upstream. https://github.com/nuxt/nuxt/pull/25440

📝 Checklist

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