kcms/ksmserver: Remove UI to choose a "default logout screen option"
The concept of the "default logout screen option" doesn't exist anymore in most places. The only thing that still respects the value of this setting is when you press the physical power button to show the logout screen, when using the Powerdevil option to show the logout screen when pressing the power button. This is a rather esoteric and niche use case, and showing a UI here to configure what default button is highlighted for that use case is quite heavy, misleading users into thinking that this seetting affects more than it really does. Let's remove it to simplify this KCM.
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Edited by Nate Graham