Make producer window test independent of min-RTT probing

tests/test_etcp_router_faults.c

@@ -545,7 +545,7 @@ static int lazy_send_requests(void) {
     c->peer_receive_blocked = 1; queue_set_threshold(q, 0, 0);
     for (unsigned i = 0; i < 100; i++) step();
     REQUIRE(p.calls == 1 && p.request.conn == c);
-    c->peer_receive_blocked = 0; c->inflight_limit = 0;
+    c->peer_receive_blocked = 0; c->minrtt_probe = 0; c->inflight_limit = 0;
     for (unsigned i = 0; i < 600; i++) step();
     REQUIRE(p.calls == 1 && !c->send_q->count);
     etcp_router_set_max_inflight(c, 4);