to find more places we can elide the OUString() constructor at call
sites

Change-Id: Ie09f3c61f2c4b4959c97dc98ebcbaf7c51d5d713
Reviewed-on: https://gerrit.libreoffice.org/71514
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>