flatpak: Set apps to installed upon missing runtime install
This commit is a rework of !373 The idea is that when an app's runtime is missing, or one of its should-download related refs is missing, the app will be returned as updatable by flatpak_installation_list_installed_refs_for_update(), and will be subsequently added to a transaction by gnome-software. Progress updates on the app are calculated using the progress of the related operations. However if the app itself doesn't need an update, _transaction_operation_done() will never be called for it and so its state never gets set to AS_APP_STATE_INSTALLED. Fix this by setting the app to installed when the related thing is, if the app is being skipped and the related thing is the last operation in the transaction needed for the app. It would be great to add a unit test for this, but there's no way through the flatpak plugin's API to uninstall an app's runtime without uninstalling the app, so we'd have to do something tricky like call out to "flatpak uninstall --force-remove ..."
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