Merge pull request 'Fix Cron Expression defining issue' (#157) from tcdlpds/device-mgt-core:cron-fix into apim420

Reviewed-on: community/device-mgt-core#157

components/application-mgt/io.entgra.device.mgt.core.application.mgt.core/src/main/java/io/entgra/device/mgt/core/application/mgt/core/task/ScheduledAppSubscriptionTaskManager.java

@@ -158,7 +158,7 @@ public class ScheduledAppSubscriptionTaskManager {
             TaskManager taskManager = taskService.getTaskManager(SCHEDULED_APP_SUBSCRIPTION_TASK_TYPE);
 
             TaskInfo.TriggerInfo triggerInfo = new TaskInfo.TriggerInfo();
-            triggerInfo.setCronExpression("0 0 0/24 ? * * *");
+            triggerInfo.setCronExpression("0 0 0 ? * * *");
 
             String taskName = "SCHEDULED_APP_SUBSCRIPTION_CLEANUP_TASK";
             TaskInfo taskInfo = new TaskInfo(taskName, ScheduledAppSubscriptionCleanupTask.class.getName(), null,