Make the System Settings category headers look consistent with other Kirigami lists
Summary:
Test Plan: Open the System Settings.
Reviewers: Plasma, VDG, ngraham
Reviewed By: VDG, ngraham
Subscribers: ngraham, VDG, plasma-devel, Plasma
Tags: Plasma
Maniphest Tasks: T10384
Differential Revision: https://phabricator.kde.org/D22953