Show Mtime / CTime from new restic extended attributes on Windows

[voidray]

In restic 0.17.0 the windows attribute for the created timestamp is now also included in the backup. It would be nice if the UI would also use the data. Currently Mtime and Ctime are always the same even if the actual file in the repository has different values. I also restored a file to check if it actually works, and created time / modified time were restored correctly with restic 0.17.0.

PR of mentioned change in restic: restic/restic#4807