Remove task only if in CLOSED state (MID-5033)

It looks like that when re-scheduling already closed single-run tasks
they keep their completionTimestamp set. And so they are eventually
cleaned up. This is an immediate fix, requiring tasks that are to
be cleaned to have also execution status = CLOSED. See also MID-5133.

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

@@ -2151,7 +2151,8 @@ public void cleanupTasks(CleanupPolicyType policy, Task executionTask, Operation
         List<PrismObject<TaskType>> obsoleteTasks;
         try {
             ObjectQuery obsoleteTasksQuery = prismContext.queryFor(TaskType.class)
-					.item(TaskType.F_COMPLETION_TIMESTAMP).le(timeXml)
+					.item(TaskType.F_EXECUTION_STATUS).eq(TaskExecutionStatusType.CLOSED)
+					.and().item(TaskType.F_COMPLETION_TIMESTAMP).le(timeXml)
 					.and().item(TaskType.F_PARENT).isNull()
 					.build();
             obsoleteTasks = repositoryService.searchObjects(TaskType.class, obsoleteTasksQuery, null, result);