feedback kcm: Make it about Plasma
Summary:
At the moment we were merging two different concepts into a same KCM and it was
too confusing.
Simplify making the kcm only about Plasma by removing the kill switch and
making sure the text only affects Plasma components.
Reviewers: Plasma, vkrause, davidedmundson, ngraham
Reviewed By: Plasma, davidedmundson, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24733