Bug 1631193 / D71448 reenabled the X11 socket on Wayland and disabled
the Wayland socket as the Wayland backend is not the default yet.
While giving access to the X11 socket by default was right,
dropping the Wayland socket makes testing it unnecessarily
complicated and provides negligible security benefits - Wayland,
in contrast to X11, is designed to be save. This is also reflected
in Flatpak: while for X11 there is the
the same is not exposed for Wayland.
Thus lets enable the Wayland socket again, in order so make testing
easier, helping making the Wayland backend the default sooner, which
then is an actual security benefit.