No optional chaining when accessing import.meta.env.__STORYBOOK__ in npm dist

[lukebui]

Inside the setup function, the code looks for import.meta.env.__STORYBOOK__ to make sure that storybook is setup.

In the source code, the if statement checks import.meta.env?.__STORYBOOK__, with optional chaining to make sure that import.meta.env is not undefined.

However, in the distributed npm package, the optional chaining is absent, causing problems when setting up storybook.

@nuxtjs/storybook version: 8.0.0
Nuxt version: 3.11.2
Node versions: 18.20.2
OS: WSL for Windows

Steps to reproduce:

1. Create new Nuxt project: npx nuxi@latest init nuxt-project
2. Install @nuxtjs/storybook: npx nuxi@latest module add storybook
3. Check in the node_modules directory to see that the distributed code is different from the source code.

[lukebui]

Duplicate of #538