desktopManagerHandlesLidAndPower should be set per session not global

[eduarrrd]

The state of services.xserver.displayManager.desktopManagerHandlesLidAndPower be set per session and not globally as my "none + xmonad" session wants to be true and my kde5 session wants it to be false.

While @Profpatsch 's commit 44c12dc moves the act setting downstream, this now creates a problem if the variable is set to different values as it is still of global scope. In the above example I needed to disable it globally to remove the conflict (or rather, I let kde5.enable set it globally for me).

[vcunat]

I suppose you've missed #9642 – we don't have the option anymore, for related reasons.

[Profpatsch]

Also see my comment #9642 (comment)

[eduarrrd]

@vcunat I did, thanks for pointing it out!
@Profpatsch ACK.