heal: Fix periodic healing cleanup (#10569)
heal: Fix periodic healing cleanup (#10569)

isEnded() was incorrectly calculating if the current healing sequence is
ended or not. h.currentStatus.Items could be empty if healing is very
slow and mc admin heal consumed all items.
krisis/minio,NitishT/minio,balamurugana/minio,minio/minio,donatello/minio,vadmeste/minio,NitishT/minio,donatello/minio,krisis/minio,minio/minio,NitishT/minio,balamurugana/minio,NitishT/minio,vadmeste/minio