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The [portal documentation](https://flatpak.github.io/xdg-desktop-portal/docs/doc-org.freedesktop.portal.RemoteDesktop.html) says that the Start call should return at least three values, which are `devices`, `clipboard_enabled` and `restore_token`, regardless of whether screens are included in the portal request. In particular this fixes persistence not working for apps that only request inputs and not screens like KDE Connect's remote input plugin (I have some WIP code for that here: psariputra/kdeconnect-kde@89ca5684) CCBUG: 479013