MINOR: quic: Do not display any timer value from process_timer()

This is confusing to display the connection timer from this function as it is not
supposed to update it. Only qc_set_timer() should do that.
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index 7ba47a6..dd9c354 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -529,7 +529,7 @@
 				}
 			}
 
-			if (!(mask & QUIC_EV_CONN_SPTO) && qc->timer_task) {
+			if (!(mask & (QUIC_EV_CONN_SPTO|QUIC_EV_CONN_PTIMER)) && qc->timer_task) {
 				chunk_appendf(&trace_buf,
 				              " expire=%dms", TICKS_TO_MS(qc->timer - now_ms));
 			}