fix client unsupported h2 protocol when only 443 activated (#3009)

When I remove 80 http port in Caddyfile, netbird client cannot connect server:443. Logs show error below:
{"level":"debug","ts":1733809631.4012625,"logger":"http.stdlib","msg":"http: TLS handshake error from redacted:41580: tls: client requested unsupported application protocols ([h2])"}
I wonder here h2 protocol is absent.

infrastructure_files/getting-started-with-zitadel.sh

@@ -530,7 +530,7 @@ renderCaddyfile() {
 {
   debug
 	servers :80,:443 {
-    protocols h1 h2c h3
+    protocols h1 h2c h2 h3
   }
 }