Fix IPv6 HTTP listen port

nginx.tmpl

@@ -420,7 +420,7 @@ server {
 	{{ end }}
 	listen {{ $external_http_port }} {{ $default_server }};
 	{{ if $enable_ipv6 }}
-	listen [::]:80 {{ $default_server }};
+	listen [::]:{{ $external_http_port }} {{ $default_server }};
 	{{ end }}
 	{{ $access_log }}