KF5CoreAddonsMacros: Replace "-" with "_" for KPLUGINFACTORY_PLUGIN_CLASS_INTERNAL_NAME compile definition
Otherwise we might end up with invalid class names that contain a "-" character. This can be the case for some of the Plasma KCMs.
Otherwise we might end up with invalid class names that contain a "-" character. This can be the case for some of the Plasma KCMs.