[kpropertiesdialog] Remove UI to set DBus startup type
This is only relevant in the context of KLauncher/KDEInit, which are obsolete
Even then changing this is very niche, so there is no relevant loss in functionality
This is only relevant in the context of KLauncher/KDEInit, which are obsolete
Even then changing this is very niche, so there is no relevant loss in functionality