MINOR: quic: remove wait handshake/L6 flags on init connection

The connection is allocated after finishing the QUIC handshake. Remove
handshake/L6 flags when initializing the connection as handshake is
finished with success at this stage.
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index b1ad14c..26e085f 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -5466,9 +5466,6 @@
 
 	HA_ATOMIC_STORE(xprt_ctx, conn->qc->xprt_ctx);
 
-	/* Leave init state and start handshake */
-	conn->flags |= CO_FL_SSL_WAIT_HS | CO_FL_WAIT_L6_CONN;
-
  out:
 	TRACE_LEAVE(QUIC_EV_CONN_NEW, qc);