accessibility: shift by zero

Change-Id: I4e25b0a6929cc88aa2ec1d213b8f1115de6be607
Reviewed-on: https://gerrit.libreoffice.org/12146
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>