Hardcode fewer colorSets
Summary:
We were overriding them on the background only and it would play weird with the
feature where the toolbar looks the same as the page.
BUG: 421571
Test Plan: Still feels a bit random that it keeps changing but at least it looks consistent.
Reviewers: Plasma, ngraham
Reviewed By: ngraham
Subscribers: ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D29784