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
LPS-47446 avoid hard coded strings unless they give meaning (i.e. "Old Title"), otherwise, random it to make it explicit we don't care what the value is