Ⅰ. Issue Description

客户端使用协议http2的情况下，server_tag 指令失效

Ⅱ. Describe what happened

客户端使用协议http2的情况下，server_tag 指令失效

Ⅲ. Describe what you expected to happen

客户端使用协议http2的情况下，服务器根据server_tag的配置返回server字段

Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. 配置ssl，启用http2， 配置server_tag off 。
2. 浏览器访问ssl接口，查看返回的server字段
3. server字段仍然返回

Ⅴ. Anything else we need to know?

1. If applicable, add nginx debug log doc.

Ⅵ. Environment:

• Tengine version (use sbin/nginx -V):
  Tengine version: Tengine/3.1.0
  nginx version: nginx/1.24.0
  built by gcc 13.2.1 20231014 (Alpine 13.2.1_git20231014)
• OS (e.g. from /etc/os-release): Alpine Linux v3.19
• Kernel (e.g. uname -a):
• Others: