Also specify a default StyleName for fonts
Summary:
When saving, kcm_fonts adds the default selected StyleName,
so it needs to specified here as well to avoid mismatches.
BUG: 383191
Test Plan:
Ran pkcon install with no kdeglobals.
Without this change: Bold title in the auth dialog
With this change: Normal title in the auth dialog
Reviewers: Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D7160