do not explicitly check NotShownIn it's not necessary and incomplete
Summary:
KService::noDisplay() includes qualification for
- NoDisplay entry itself
- OnlyShowIn and NotShowIn
- X-KDE-OnlyShowOnQtPlatforms
- authorization WRT KCMs
as such checking nodisplay is good enough to disqualify services in all
relevant scenarios
Test Plan: - read the code of noDisplay()
Reviewers: broulik
Reviewed By: broulik
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D3705