fix: Build on windows with cross-platform path compatibility (no-changelog)

[kob490]

I kept getting the following error when running 'pnpm build' on windows:

n8n-editor-ui:build: error during build:
n8n-editor-ui:build: [vite-plugin-static-copy:build] No file was found to copy on <myfolder>\n8n\packages\editor-ui\node_modules\web-tree-sitter\tree-sitter.wasm src.

this change is a fix for that build failure and should ensure cross-platform compatibility