`desktopManagerHandlesLidAndPower default `false`

Changes the option and explicitely sets it for each desktopManager.

Reasoning: Currently,
services.xserver.displayManager.desktopManagerHandlesLidAndPower is set
to true by default. This creates a problem for users without desktop
environments activated, since lid management simply doesn't work
(and they have to be lucky to find this option).

See issue #9671