Svelte field in package.json

Using this package throws the following warning.
```
[vite-plugin-svelte] WARNING: The following packages have a svelte field in their package.json but no exports condition for svelte.
```

As using the svelte field in package.json has been deprecated for a while now.

Ref: https://github.com/sveltejs/vite-plugin-svelte/blob/main/docs/faq.md#missing-exports-condition