net.http: fix server_tls h2-negotiation test for default-on HTTP/2

[quaesitor-scientiam]

Problem

test_server_tls_h2_negotiation (vlib/net/http/server_tls_test.v) is currently red on master CI — clang-linux, gcc-linux, tcc-linux, clang-macos:

vlib/net/http/server_tls_test.v:138: fn test_server_tls_h2_negotiation
   > assert resp_h1.version() == .v1_1
     Left value (len: 8): `HTTP/2.0`
    Right value (len: 8): `HTTP/1.1`

The test was written before #27384 and assumed a plain http.fetch() (no enable_http2 field) is served as HTTP/1.1. #27384 flipped enable_http2 to default true, so the client now advertises h2 via ALPN by default and the server correctly upgrades — making the .v1_1 assertion fail.

Fix

The server behavior is correct; the test just needs to opt out of HTTP/2 explicitly on the leg that means to exercise the HTTP/1.1 path. Pass enable_http2: false on the resp_h1 fetch (and update the comment to match). The h2 leg above it already passes enable_http2: true, so both directions are now covered explicitly.

Verification

v test vlib/net/http/server_tls_test.v passes; v fmt -verify clean.

🤖 Generated with Claude Code

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