delay ksplash until after env is set up
otherwise we can dbus invoke with the wrong environment. specifically this happens with the latest qtbase changes that introduced color picking support on wayland. when we start a qguiapplication with incomplete environment that dbus invokes the xdg-portal system and that in turn has an incomplete environment resulting in theming and the likes not properly applying because the portal doesn't know that it runs inside a plasma session. qt/qt/qtbase@2dc083df BUG: 458865