Experience on wayland regressed

[Aleix Pol]

Hi,
Since the recent removal of QT_QPA_PLATFORM=wayland, we lost some
functionality. At the moment it seems that kded is being ran as xcb so
the per-screen scaling isn't being set up. Also system settings shows
the behavior for xcb instead of the one for wayland also with the
per-display UX broken.

I also see that Spectacle is now even more broken as it's trying to
ask xcb for the screenshots.

Aleix