Remove unused 'root' property from meta.cn.json

Deleted the 'root' property from the Chinese API reference metadata file as it is no longer needed.

Author: hotlong

content/docs/references/meta.cn.json

@@ -1,6 +1,5 @@
 {
   "title": "API 参考",
-  "root": true,
   "pages": [
     "data",
     "ui",