Line color is changed in CategoryListBox::UserDraw() method so we
need to explicitely specify it here too.

Reviewed-on: https://gerrit.libreoffice.org/47083Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>
(cherry picked from commit 33bd6c3e)

Change-Id: Ia3dcbf70e0a53cfba16d5d2df0fc2e4d7e23ad71