fix: `cssclasses` was not applied on folder note (index) (#749)

Mara-Li

2024-01-29 16adbd30114bfcc1aaefa851a5a1786787f97a10

 quartz/plugins/index.ts

@@ -30,5 +30,6 @@
  interface DataMap {
    slug: FullSlug
    filePath: FilePath
    relativePath: FilePath
  }
}