Do not do any xrandr settings on user desktop session, this
should not be needed now that gnome-settings-daemon xrandr plugin
is "active", but should do nothing by default.
(Except of course when going into an x2go session).
Remove ~/.config/monitor.xml on ltspservers and fatclients,
but keep it on laptops where it actually makes sense for users to
persistently override display settings if they want to (it does
not matter if there are xrandr settings in Puavo or not).