fix: apply chunkFileNames on windows

[danielroe]

🔗 Linked issue

nuxt/nuxt#15244

❓ 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

We currently use startsWith but the chunk on windows has backslashes so this needs to be normalised first to match our internal buildServerDir.

📝 Checklist

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

[codecov]

Codecov Report

Merging #1189 (c5b2639) into main (720fe29) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1189   +/-   ##
=======================================
  Coverage   77.19%   77.20%           
=======================================
  Files          67       67           
  Lines        6639     6641    +2     
  Branches      734      734           
=======================================
+ Hits         5125     5127    +2     
  Misses       1513     1513           
  Partials        1        1           

Impacted Files	Coverage Δ
src/rollup/config.ts	89.58% <100.00%> (+0.04%)	⬆️

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