Similar to the previous crashes, if you switch panels after forgetting a
network while the toast is still alive, Settings crashes. This is
because the AdwToastOverlay is not properly disposed because the Saved
Networks dialog is also not destroyed.
However, destroying the saved networks dialog still leaves a crash,
because the overlay disposal first unreferences its child, but we still
need that for the dismissal of the waiting toasts. Therefore, we keep an
extra reference to the saved networks list.
To prevent further crashing, we cannot set "list" to NULL, because there
may be multiple async calls. Also, we have to keep a reference to self
in the async call, otherwise it does not work when you remove many
networks and then switch panels.
As an added bonus, we can now use the saved networks list inside the UI
refresh function.
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