Make task queue optional in Nexus SAA sample

Author: atol

core/src/main/java/io/temporal/samples/nexusstandaloneactivity/handler/GreetingNexusServiceImpl.java

@@ -30,9 +30,6 @@ public class GreetingNexusServiceImpl {
                     // Use a business identifier from the operation input so callers can identify
                     // the same Activity independently of any individual Nexus request.
                     .setId(getActivityId(input))
-                    // The task queue is required. This sample runs the Activity on the same queue
-                    // as the Nexus Worker that is handling this operation.
-                    .setTaskQueue(Nexus.getOperationContext().getInfo().getTaskQueue())
                     .setStartToCloseTimeout(Duration.ofSeconds(10))
                     .build()));
   }