fix: runtimeConfig and appConfig changes are not triggering reactivity

[antony-k1208]

🐛 The bug

It seems that updating the runtimeConfig and the appConfig doesn't have an effect on the reactive values in Nuxt.

🛠️ To reproduce

https://stackblitz.com/edit/github-pptyqfgu?file=app%2Fapp.vue,nuxt.config.ts,app%2Fapp.config.ts

🌈 Expected behavior

Updating values in runtimeConfig or appConfig should result in updates in the corresponding objects in the current Nuxt instance and you should see the changes in your application.

ℹ️ Additional context

No response