fix(netlify-v2): netlify not finding getGeneratorString

[Rigo-m]

🔗 Linked issue

#2426

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Publishing to netlify, the functions fails with this error: getGeneratorString is not defined

@serhalp could you take a quick look?

Reproduction link in linked issue

https://github.com/Rigo-m/netlify-v2-repro/tree/patch-fix this branch contains a custom preset with the proposed fix
and it displays correctly in netlify https://patch-fix--netlify-v2-nitro.netlify.app/

📝 Checklist

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

[serhalp]

LGTM, thanks for fixing!

[pi0]

Thanks ❤️ The fix is included in #2446