Bugfix: Report the correct owner of directories in FUSE mounts

Restic 0.10.0 changed the FUSE mount to always report the current user
as the owner of directories within the FUSE mount, which is incorrect.

This is now changed back to reporting the correct owner of a directory.

https://github.com/restic/restic/issues/2563
https://github.com/restic/restic/pull/3141
