portals.conf: Let GNOME handle the Access portal
xdg-desktop-portal-gnome now implements the Access portal, and proxies it to GNOME Shell if no parent window is passed. GNOME Shell is not a portal implementation anymore.
xdg-desktop-portal-gnome now implements the Access portal, and proxies it to GNOME Shell if no parent window is passed. GNOME Shell is not a portal implementation anymore.