switch our installed hicolor icons to the ones from breeze

Summary:
the old crystal icons are getting a bit long in the tooth and are
inconsistent on our windows build which use the breeze icons by default

Reviewers: sandsmark, ltoscano

Reviewed By: ltoscano

Subscribers: ltoscano, kde-utils-devel

Differential Revision: https://phabricator.kde.org/D8935