and fix a bug in ScChangeActionContent::SetValueString where it was
passing the grammar as the ScMatrixMode to the ScFormulaCell
constructor.

Change-Id: I7c1a174cdd8365dedc30cff0b26e3079bb8b84f3
Reviewed-on: https://gerrit.libreoffice.org/35552Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>