Moved from PrivateStorageio/PrivateStorageDesktop#35.

This seems to be a GridSync issue, not a PrivateStorage Desktop issue.

(/cc @adrianmay)

Independently of whether the linux or windows versions are used, when we generate a r/o invite from one instance and import it into another, the recipient fails the import but creates a local import directory by the requested name which appears on the UI as always syncing and blocks imports of any other folder to the same local directory name.