Fixes booting to a black screen when using gamescope-autologin under GNOME
This workaround was written to explicitly use KWin and doesn't seem to be an
issue anyway. Exclude from GNOME images and leave in place for KDE images
* feat(gnome): Use GDM on desktop
Restores GDM on desktop and implements GNOME autologin with GDM support. This allows
users to use screen locking. Omitted from Steam Deck as there isn't a seemingly clean
way to implement this for session switching. Will investigate in the future
* fix(gnome): Restore patched xorg-x11-server-Xwayland package for VRR
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Co-authored-by: Kyle Gospodnetich <me@kylegospodneti.ch>