Bugfix: Use correct directory owner in fuse mount

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.
We have changed this back to use the correct owner of a directory.

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