BUG/MINOR: quic: Possible wrong PTO computing

As timestamps based on now_ms values are used to compute the probing timeout,
they may wrap. So, use ticks API to compared them.

Must be backported to 2.7 and 2.6.
diff --git a/src/quic_loss.c b/src/quic_loss.c
index eff8e6c..bb518ca 100644
--- a/src/quic_loss.c
+++ b/src/quic_loss.c
@@ -128,7 +128,7 @@
 
 		p = &qc->pktns[i];
 		tmp_pto = tick_add(p->tx.time_of_last_eliciting, duration);
-		if (!tick_isset(lpto) || tmp_pto < lpto) {
+		if (!tick_isset(lpto) || tick_is_lt(tmp_pto, lpto)) {
 			lpto = tmp_pto;
 			pktns = p;
 		}