[ViLT] Fix checkpoint url in config (#15790)
* [ViLT] Fix checkpoint url in config
* Apply suggestions from code review
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>