KAFKA-12326: Corrected regresion in MirrorMaker 2 executable introduc…

…ed with KAFKA-10021 (#10122)

Fixes the recent change to the `MirrorMaker` class (used only in the MirrorMaker 2 executable) that uses a `SharedTopicAdmin` client as part of Connect, so that the correct properties into the `SharedTopicAdmin`.

Author: Randall Hauch <rhauch@gmail.com>
Reviewer: Konstantine Karantasis <konstantine@confluent.io>

connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorMaker.java

@@ -235,7 +235,7 @@ private void addHerder(SourceAndTarget sourceAndTarget) {
         DistributedConfig distributedConfig = new DistributedConfig(workerProps);
         String kafkaClusterId = ConnectUtils.lookupKafkaClusterId(distributedConfig);
         // Create the admin client to be shared by all backing stores for this herder
-        Map<String, Object> adminProps = new HashMap<>(config.originals());
+        Map<String, Object> adminProps = new HashMap<>(distributedConfig.originals());
         SharedTopicAdmin sharedAdmin = new SharedTopicAdmin(adminProps);
         KafkaOffsetBackingStore offsetBackingStore = new KafkaOffsetBackingStore(sharedAdmin);
         offsetBackingStore.configure(distributedConfig);