Fixed. Note that the undo button is still grayed out. Calc has not set an undo step.

Change-Id: I7ff713a906b365b460351e5202161c9152542395
Reviewed-on: https://gerrit.libreoffice.org/14489Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>