Remove dead code from SdrObjEditView

Change-Id: I0a15b3567718d08edb4405146f6172c3939e06c1
Reviewed-on: https://gerrit.libreoffice.org/8552
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>