fix findAndCountAll total 返回值不正确的Bug,
distinct: true, // sequelizejs 使用 findAndCountAll、required 连表查询并统计有误 https://www.onlyling.com/archives/245
distinct: true, // sequelizejs 使用 findAndCountAll、required 连表查询并统计有误 https://www.onlyling.com/archives/245