[kcmkwin/kwindecoration] Fix Get Hot New Stuff
Summary:
Found better categories for GHNS v3: looks like only Aurorae is supported?
Also refresh the themes when you close the GHNS window, in case something was downloaded.
Test Plan: Open GHNS, download new theme, close GHNS -> new theme visible
Reviewers: leinir, graesslin, KWin, davidedmundson
Reviewed By: leinir, KWin, davidedmundson
Subscribers: ngraham, cfeck, kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D18935