Fixed the fix for MID-3706 (dryRun for parallel tasks)

repo/task-quartz-impl/src/main/java/com/evolveum/midpoint/task/quartzimpl/TaskQuartzImpl.java

@@ -2499,7 +2499,7 @@ public Task createSubtask(LightweightTaskHandler handler) {
 		TaskQuartzImpl sub = ((TaskQuartzImpl) createSubtask());
         sub.setLightweightTaskHandler(handler);
 		lightweightAsynchronousSubtasks.add(sub);
-		parentForLightweightAsynchronousTask = this;
+		sub.parentForLightweightAsynchronousTask = this;
         return sub;
     }