Fix highestKnownQcRound at round update (#660)

Merging this. Unit test failures are mocks breaking. Will ask Lukasz to fix in a follow-up PR.

Author: dhedey

core/src/main/java/com/radixdlt/consensus/liveness/Pacemaker.java

@@ -175,8 +175,8 @@ public void start() {
   public void processRoundUpdate(RoundUpdate roundUpdate) {
     log.trace("Round Update: {}", roundUpdate);
     this.latestRoundUpdate = roundUpdate;
-    if (currentRound().gt(this.highestKnownQcRound)) {
-      this.highestKnownQcRound = roundUpdate.getCurrentRound();
+    if (roundUpdate.getHighQC().getHighestRound().gt(this.highestKnownQcRound)) {
+      this.highestKnownQcRound = roundUpdate.getHighQC().getHighestRound();
     }
     this.startRound();
   }