fdo#84848 enable 'save as' button in toolbar

Change-Id: Ie84ad526f6756e996e1955610d0a9c627d1e0c8c
Reviewed-on: https://gerrit.libreoffice.org/13060
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>