nixos/deepin: Enable all x-d-p-gtk portals

This will fix the conflict when another DE using the full `xdg-desktop-portal-gtk` is enabled simultaneously with Deepin.
Currently, our Deepin uses `gtk` as the preferred default implementation for all portals so presumably the duplicate portals should not have been disabled anyway.
The added closure size should be negligible, as most of the packages are probably also used by Deepin transitively.

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