MINOR: quic: call ->pacing_delay_ns() CC callback

This callback returns the pacing delay between packet (or bursts) to
be sent depending on the underlying congestion control algorithm.
Call it from qc_send_mux() which needs this delay value.

Author: haproxyFred

src/quic_tx.c

@@ -499,7 +499,8 @@ enum quic_tx_err qc_send_mux(struct quic_conn *qc, struct list *frms,
 	}
 
 	if (pacer) {
-		const ullong ns_pkts = quic_pacing_ns_pkt(pacer);
+		struct quic_cc *cc = &qc->path->cc;
+		const ullong ns_pkts = cc->algo->pacing_delay_ns(cc);
 		max_dgram = global.tune.quic_frontend_max_tx_burst * 1000000 / (ns_pkts + 1) + 1;
 	}