Revert "Update post_user_delete"

This reverts commit fe30b2868e943fad0e1314d68b70fa3f5f35d46f

hooks/post_user_delete

@@ -2,7 +2,7 @@
 source /usr/share/yunohost/helpers
 
 user=$1
-app="zabbix"
+app="ynhzabbix"
 
 db_name=$(ynh_app_setting_get $app db_name)
 db_user=$(ynh_app_setting_get $app db_user)