and simplify the resulting SfxItemInfo field down to a single bool

Change-Id: I73e24e83d39afc7660ac85872ba96bc790713cb2
Reviewed-on: https://gerrit.libreoffice.org/23058Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>