diy选择文章分类问题修复

(cherry picked from commit d18c15bb5306ab7dd9e9381f93fa333df93ab790)

crmeb/app/dao/article/ArticleCategoryDao.php

@@ -73,7 +73,6 @@ class ArticleCategoryDao extends BaseDao
             ->where('hidden', 0)
             ->where('is_del', 0)
             ->where('status', 1)
-            ->where('pid', '>', 0)
             ->order('sort DESC')
             ->field('id,pid,title')
             ->select()->toArray();