MINOR: quic: Fix handshake state debug strings

There was a collision between QUIC_HS_ST_CLIENT_HANDSHAKE_FAILED
and QUIC_HS_ST_CONFIRMED states.
diff --git a/include/haproxy/quic_tls.h b/include/haproxy/quic_tls.h
index 12ce734..d7ec049 100644
--- a/include/haproxy/quic_tls.h
+++ b/include/haproxy/quic_tls.h
@@ -179,9 +179,9 @@
 	case QUIC_HS_ST_SERVER_HANDSHAKE_FAILED:
 		return "SF";
 	case QUIC_HS_ST_COMPLETE:
-		return "CP";
+		return "HCP";
 	case QUIC_HS_ST_CONFIRMED:
-		return "CF";
+		return "HCF";
 	}
 
 	return NULL;