LPS-47446 Don't call dlAppHelperService when updating the default folder
LPS-47446 Format source
LPS-47446 Apply to local service
LPS-47446 check folderId instead of folder before calling dlAppHelper
LPS-47446 add tests to document current behaviour

In the test for DLAppService we're simply checking that it doesn't fail.
LPS-47446 Format source