chore: remove duplicated mentionsUsers relation

Author: luceos

extensions/mentions/extend.php

@@ -51,8 +51,7 @@
         ->belongsToMany('mentionedBy', Post::class, 'post_mentions_post', 'mentions_post_id', 'post_id')
         ->belongsToMany('mentionsPosts', Post::class, 'post_mentions_post', 'post_id', 'mentions_post_id')
         ->belongsToMany('mentionsUsers', User::class, 'post_mentions_user', 'post_id', 'mentions_user_id')
-        ->belongsToMany('mentionsGroups', Group::class, 'post_mentions_group', 'post_id', 'mentions_group_id')
-        ->belongsToMany('mentionsUsers', User::class, 'post_mentions_user', 'post_id', 'mentions_user_id'),
+        ->belongsToMany('mentionsGroups', Group::class, 'post_mentions_group', 'post_id', 'mentions_group_id'),
 
     new Extend\Locales(__DIR__.'/locale'),