Fix KafkaMLCTests for proper number in CountDownLatch

Author: artembilan

spring-kafka/src/test/java/org/springframework/kafka/listener/KafkaMessageListenerContainerTests.java

@@ -3841,7 +3841,7 @@ public void onMessage(ConsumerRecord<Integer, String> data) {
 		containerProps.setMessageListener(messageListener);
 		containerProps.setClientId("clientId");
 
-		CountDownLatch afterLatch = new CountDownLatch(1);
+		CountDownLatch afterLatch = new CountDownLatch(2);
 		RecordInterceptor<Integer, String> recordInterceptor1 = spy(new RecordInterceptor<Integer, String>() {
 
 			@Override