Going via UNO for a class in the same module is an overkill.

Change-Id: Idf706782e5844fd2e553c44966e1dd1104dce8e7
Reviewed-on: https://gerrit.libreoffice.org/32030Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>