单个隧道流量统计无效，只有对客户端的汇总流量统计

Describe the bug 流量统计在单条透传设置中无效，只在客户端用户的总流量里有统计流量

To Reproduce Steps to reproduce the behavior:

1. Opening '...'
2. Click on '....'
3. See error

Expected behavior 单独对每个透传隧道统计流量.

Screenshots or logs

Server (please complete the following information):

• OS: [e.g. Synology NAS]
• ARCH: [e.g. x86 x64]
• Tunnel [e.g. TCP]
• Version [e.g. 0.26.20]

Client (please complete the following information):

• OS: [e.g. Synology NAS]
• ARCH: [e.g. x86 x64]
• Tunnel [e.g. TCP]
• Version [e.g. 0.26.20]

Additional context Add any other context about the problem here.