remove unnecessary update

Author: TaiJuWu

raft/src/main/java/org/apache/kafka/raft/LeaderState.java

@@ -720,7 +720,6 @@ private boolean maybeUpdateHighWatermark() {
 
         int indexOfHw = voterStates.size() / 2;
         Optional<LogOffsetMetadata> highWatermarkUpdateOpt = followersByDescendingFetchOffset.get(indexOfHw).endOffset;
-        highWatermark.ifPresent(this::updateCommittedVoter);
 
         if (highWatermarkUpdateOpt.isPresent()) {