window: Do not show fullscreen toolbar if in kiosk mode
    
    Regression since commit cc455b7f916110d7cfae6b7af753349e070c9494.
    
    Related: https://bugzilla.redhat.com/show_bug.cgi?id=1446161
    
    Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>