Summary:
We're moving towards using the small font for subtitles in Kirigami BasicListItem (D29432)
so we should probably do the same here since it has the same title + subtitle layout.
Test Plan:
Before: {F8284752}
After: {F8284751}
Reviewers: #plasma, #vdg, broulik, ndavis
Reviewed By: #vdg, ndavis
Subscribers: cblack, kde-frameworks-devel
Tags: #frameworks
Differential Revision: https://phabricator.kde.org/D29434