fix: correct community category migration rank

docs/sql/create_community_post_categories.sql

@@ -124,12 +124,12 @@ INNER JOIN (
       ROW_NUMBER() OVER (
         PARTITION BY post_tag.`post_id`
         ORDER BY tag.`sort` DESC, post_tag.`id` ASC
-      ) AS row_number
+      ) AS `post_rank`
     FROM `la_community_post_tag` post_tag
     INNER JOIN `la_community_tag` tag ON tag.`id` = post_tag.`tag_id`
     INNER JOIN `la_community_post_category` category ON category.`id` = post_tag.`tag_id`
   ) ranked
-  WHERE ranked.row_number = 1
+  WHERE ranked.`post_rank` = 1
 ) selected_category ON selected_category.`post_id` = post.`id`
 SET post.`category_id` = selected_category.`category_id`
 WHERE post.`category_id` = 0;