the getGuiEventListener method is unnecessary

Change-Id: I1c8b0ea28b6dbc2b6825f5f30ae0d234b7362d64
Reviewed-on: https://gerrit.libreoffice.org/13093
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>