MINOR: h3: Missing connection argument for a TRACE_LEAVE() argument

This should help in debbuging issues to be able to associate this trace to a
QUIC connection.

Must be backported to 2.6.
diff --git a/src/h3.c b/src/h3.c
index f1cf4e1..e42089d 100644
--- a/src/h3.c
+++ b/src/h3.c
@@ -605,7 +605,7 @@
 		}
 	}
 
-	TRACE_LEAVE(H3_EV_RX_FRAME|H3_EV_RX_SETTINGS);
+	TRACE_LEAVE(H3_EV_RX_FRAME|H3_EV_RX_SETTINGS, h3c->qcc->conn);
 	return ret;
 }