Change Activities KCM icon
Summary:
KCMs should have color icons while widgets should have monochrome icons, so I have changed the name of the KCM icon.
Depends on D18529
Reviewers: VDG, Plasma, ngraham
Reviewed By: VDG, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D18530