Do not prefix synchronized folder name with ancestors when there is no duplicated root

This is related to NXDRIVE-2694 to avoid conflict when 2 roots have the same title/name

Steps to reproduce:

1. Connect Drive to your local Nuxeo instance
2. go to Nuxeo WebUI and create a workspace under Domain > Workspaces : name = "My workspace"
3. click on the Synchronize button
4. wait for a while and observe that a folder "Domain - Workspaces - My workspace" has been created on your local computer

Expected behavior: the local name should be "My workspace" because there is no other synchronized root with this name/title