Setting class on `ile-root`

[troubleshooting section]: https://iles-docs.netlify.app/faqs/troubleshooting

- [x] I have read the __[troubleshooting section]__ before opening an issue.
- [x] I have tried upgrading `iles` and `vite`.

### Description 📖

This is a follow-up to the resolution of #150.

I have a problem with the approach taken in resolving #150. Using that approach it is not possible to set different classes on the `` wrapper and the component it encloses. Seems like setting just `class` makes both take the same value.

### Reproduction 🐞

Taking the same example as #150. The code

```html

```

now produces

```html

```

Consider if `.child` has CSS rule like `font-size: 2em`, the above code would make the font 4 times larger, not two. This is a pretty unexpected result.

Dependencies Info

_Run `npx iles info` and `pnpm list` (or `npm list`) and provide the output:_

```
iles v0.9.0 vite v4.0.3
```