kcms: drop the code for migration of old kde4 based config
This should not be relevant nowadays, and can be safely dropped.
See also : https://mail.kde.org/pipermail/plasma-devel/2020-February/110655.html
This should not be relevant nowadays, and can be safely dropped.
See also : https://mail.kde.org/pipermail/plasma-devel/2020-February/110655.html