fix(vite): resolve relative path in rollupOptions

[agufagit]

When i specify relative dir for rollupOptions output

rollupOptions: {
  output: [
    {
        dir: "dist/es"
     }
  ]
}

In one project with only .ts files, it resolved to "dist/es". However, in vue project, it resolved to absolute path "/home/xxx/project/dist/es".

This fix will handle absolute path postcss-plugin matching

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