Terminology fixes in KCMs: KDE-as-the-desktop -> Plasma
Summary: Fix the reference to KDE (or remove them when not strictly needed).
Test Plan: The code still compiles.
Reviewers: davidedmundson
Reviewed By: davidedmundson
Subscribers: sebas, lukas, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D6469