fix(frontend): normalise route path with vite in @remix-run/dev

[sebastien-comeau]

Description

Fixes Remix config optimizeDeps.entries for Vite Dep Optimization Options on Windows. I've tested it in Windows and Linux and no issue on both platforms.

Related PR created by me on Remix remix-run/remix#10258

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Checklist

• I have tested the changes locally
• I have updated the documentation if necessary
• I have added/updated tests that prove my fix is effective or that my feature works
• I have checked that my code follows the project's coding style by running npm run format:check
• I have checked that my code contains no linting errors by running npm run lint
• I have checked that my code contains no type errors by running npm run typecheck
• I have checked that all unit tests pass by running npm run test:unit -- run
• I have checked that all e2e tests pass by running npm run test:e2e

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