Do not manually specify vendor.conf path
    
    This path is now the upstream default location since:
    
    https://gitlab.gnome.org/GNOME/gnome-initial-setup/-/merge_requests/85
    
    so we don't need to specify it manually. Doing so has an undesirable
    side effect: it disables the search path feature, so I cannot override
    the configuration in /usr/share by creating an
    /etc/gnome-initial-setup/vendor.conf as I would expect.