[bug] did-auth 还是会出现 seller duplicate setup_swap 的问题

[wangshijun]

      // Prevent duplicate setup_swap in case user is retrying
      if (req.swap.status === 'seller_setup') {
        res.json({ error: 'A retrieve is in progress, please retry if that retrieve failed' });
        return;
      }
      await this.swapStorage.update(traceId, { status: 'seller_setup' });

如果 swap 记录状态更新速度过慢，客户端就能重放成功。