[kcm-colors] Do not ship any additional color schemes
Summary: This patch removes the extra color schemes we have been shipping for quite a while. Reasoning is explained in Phabricator task T10497.
delete the contents of usr/share/color-schemes/
Reviewed By: VDG, ngraham
Subscribers: broulik, abetts, davidedmundson, nicolasfella, plasma-devel
Maniphest Tasks: T10497
Differential Revision: https://phabricator.kde.org/D21701