Remove unnecessary ParameterizedMember copy in connect_udp_tunnel

PiperOrigin-RevId: 974591903

quiche/quic/tools/connect_udp_tunnel.cc

diff --git a/quiche/quic/tools/connect_udp_tunnel.cc b/quiche/quic/tools/connect_udp_tunnel.cc
index f850bfc..9427b74 100644
--- a/quiche/quic/tools/connect_udp_tunnel.cc
+++ b/quiche/quic/tools/connect_udp_tunnel.cc
@@ -393,7 +393,7 @@
       {{"error", std::move(proxy_status_error_item)},
        {"details", std::move(proxy_status_details_item)}});
   std::optional<std::string> proxy_status_value =
-      structured_headers::SerializeList({proxy_status_member});
+      structured_headers::SerializeList({std::move(proxy_status_member)});
   QUICHE_CHECK(proxy_status_value.has_value());
   headers["Proxy-Status"] = *proxy_status_value;