Added an else statement to take into account that a hidden column
has a neighboured left column with a right border.

Change-Id: Ia415d422dd2fa305604e48cce55661408b835ea6
Reviewed-on: https://gerrit.libreoffice.org/63326
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
(cherry picked from commit 392729c7)
Reviewed-on: https://gerrit.libreoffice.org/67058Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>