we can just take a "const &".
(found by running clang-tidy with the
performance-unnecessary-copy-initialization warning)
Change-Id: I20fd208c65303da78170b1ac06c638fdf3aa094b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/176267
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Jenkins
