kded: fix invalid module name
As said in this comment, module names must be separated by underscores, otherwise the following warning appears: kf.dbusaddons: The kded module name "kded_plasma-mobile-start" is invalid!.
As said in this comment, module names must be separated by underscores, otherwise the following warning appears: kf.dbusaddons: The kded module name "kded_plasma-mobile-start" is invalid!.