The controller in charge of dismissing an item will have an insight into
whether it will cause a re-query for an existing cursor or not. If a re-query
will occur in response to a `ContentResolver#notifyChange()` invokation (in this
case in response to updating `AppPrefs`), then the `UpdatesAdapter` doesn't
need to rebuild itself yet. If it is a status update, then it should update
the adapter right away.
Seeing as the controller was already returning one thing (a message to be
displayed in a `Toast` and now it also needs to return an opinion on whether
to rebuild the adapter or not, this has been extracted into a value object
which has a message and a rebuild adapter flag.
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