Made nun sense.

Also cleanup a bit, we enabled gnome-settings-daemon even when using elementary-settings-daemon.
I wanted the nixos module ascribe the defaults, not these lists in pkgs.

…end to defaults

Wingpanel was designed firstly as an indicator renderer,
and as such just a container for indicators that are distributed
outside itself. Being able to control which and each indicator with
`indicators` is confusing, ideally each of the default indicators
would be shipped with wingpanel itself. I don't see how this
kind of extensibility would be useful to a user so we're going
to append to the expected defaults. The `useDefaultIndicators`
argument is there to development test a single indicator/s.

…efaults

Switchboard was designed identically to Wingpanel, so the same justification
stands here.

…icators