MINOR: Skip quota check when replica is in sync (#6344)

Reviewers: Jason Gustafson <jason@confluent.io>

core/src/main/scala/kafka/server/ReplicaFetcherThread.scala

@@ -328,7 +328,7 @@ class ReplicaFetcherThread(name: String,
    */
   private def shouldFollowerThrottle(quota: ReplicaQuota, topicPartition: TopicPartition): Boolean = {
     val isReplicaInSync = fetcherLagStats.isReplicaInSync(topicPartition)
-    quota.isThrottled(topicPartition) && quota.isQuotaExceeded && !isReplicaInSync
+    !isReplicaInSync && quota.isThrottled(topicPartition) && quota.isQuotaExceeded
   }
 
 }

core/src/main/scala/kafka/server/ReplicaManager.scala

@@ -1007,7 +1007,7 @@ class ReplicaManager(val config: KafkaConfig,
     val isReplicaInSync = nonOfflinePartition(topicPartition).exists { partition =>
       partition.getReplica(replicaId).exists(partition.inSyncReplicas.contains)
     }
-    quota.isThrottled(topicPartition) && quota.isQuotaExceeded && !isReplicaInSync
+    !isReplicaInSync && quota.isThrottled(topicPartition) && quota.isQuotaExceeded
   }
 
   def getLogConfig(topicPartition: TopicPartition): Option[LogConfig] = localReplica(topicPartition).flatMap(_.log.map(_.config))