fdo#78815 Fix report builder toolbox controller

Change-Id: Iecbf84b29500729e228d22c8e50b119d1fb471c5
(cherry picked from commit 214de0e5124b44df0f37fdf89271a527667590dc)
Reviewed-on: https://gerrit.libreoffice.org/9422
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>