Added missing code to set icon for draw in grid mode.

Change-Id: I9ee356d5ab1a296a90e5ece11f5f4c50e7600f13
Reviewed-on: https://gerrit.libreoffice.org/19921Reviewed-by: jan iversen <jani@documentfoundation.org>
Tested-by: jan iversen <jani@documentfoundation.org>
Tested-by: Jenkins <ci@libreoffice.org>