datasource-rootPath is duplicated if content is created in a inner folder

Steps to reproduce:

1. Modify /dam-app-jcr/decorations/dam-assets-app/apps/dam.subApps.yaml and add rootPath: /travel-demo to the defined datasource.
2. Go to Assets app and try to upload a new asset into one of the existing folders.

Current result

An error comes up because the rootPath is duplicated:

Message: javax.jcr.PathNotFoundException: /travel-demo/travel-demo/social-icons. Stack trace: info.magnolia.jcr.RuntimeRepositoryException: javax.jcr.PathNotFoundException: /travel-demo/travel-demo/social-icons

Expected result

The detail is open and a new asset can be uploaded

NOTES:
Assets app is just an example, it happens in all apps that has rootPath defined.

Developer notes

Upload works only at root level.