kio_file: honour KIO::StatResolveSymlink for UDS_DEVICE_ID and UDS_INODE

Summary:
This was inconsistent, for everything else we follow symlinks,
unless StatResolveSymlink isn't set.

Test Plan: see D27951

Reviewers: trmdi, ahmadsamir, meven

Reviewed By: ahmadsamir, meven

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D28388