Added Highlighting tab to Edit Style button in impress

Change-Id: I9426f583da4078cd380823bbaa30ce1941ffa3bd
Reviewed-on: https://gerrit.libreoffice.org/23684Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>