Moved buttons columns to the bottom row

Change-Id: If1789999363739231986e0e0e82c9d77f5ca0bc7
Reviewed-on: https://gerrit.libreoffice.org/7192
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>