fix(prerender): allow to fetch static files

[danielroe]

🔗 Linked issue

nuxt/nuxt#21722

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 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

This allows access to static files whilst prerendering - which I think would be a common use case.

📝 Checklist

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

[codecov]

Codecov Report

Merging #1340 (ba2772c) into main (ed69bae) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1340      +/-   ##
==========================================
+ Coverage   76.62%   76.68%   +0.05%     
==========================================
  Files          70       70              
  Lines        7161     7162       +1     
  Branches      709      710       +1     
==========================================
+ Hits         5487     5492       +5     
+ Misses       1672     1669       -3     
+ Partials        2        1       -1     

Impacted Files	Coverage Δ
src/presets/nitro-prerender.ts	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes