uncomment

Signed-off-by: Matt Peterson <matt.peterson@swirldslabs.com>

Author: mattp-swirldslabs

server/src/main/java/com/hedera/block/server/mediator/LiveStreamMediatorImpl.java

@@ -155,7 +155,7 @@ public void unsubscribe(
             final BlockItemEventHandler<ObjectEvent<SubscribeStreamResponse>> handler) {
 
         // Shutdown the handler
-//        handler.awaitShutdown();
+        handler.awaitShutdown();
 
         // Remove the subscriber
         final var batchEventProcessor = subscribers.remove(handler);