Replace gfe2_reloadable_flag_quic_enable_zero_rtt_for_tls with gfe2_restart_flag_quic_enable_zero_rtt_for_tls_v2

PiperOrigin-RevId: 323869022
Change-Id: I94b28b05adfba5e554be44154064fd19da91e166
diff --git a/quic/core/tls_server_handshaker.cc b/quic/core/tls_server_handshaker.cc
index f4c4a8a..518632d 100644
--- a/quic/core/tls_server_handshaker.cc
+++ b/quic/core/tls_server_handshaker.cc
@@ -381,7 +381,7 @@
     // FinishHandshake, we don't have any confirmation that the client is live,
     // so all end of handshake processing is deferred until the handshake is
     // actually complete.
-    QUIC_RELOADABLE_FLAG_COUNT(quic_enable_zero_rtt_for_tls);
+    QUIC_RESTART_FLAG_COUNT(quic_enable_zero_rtt_for_tls_v2);
     return;
   }
   if (!valid_alpn_received_) {