
We currently wait until we got a connection to NetworkManager. That's possible because the old PanelMenu indicator API takes a menu, so it is possible to add or remove items dynamically later. That won't be the case with quick settings, where `quickSettingsItems` is a plain array that is only read once when adding the indicator. Prepare for that by moving section initialization into the constructor. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2407>