Don't show entries with NoDisplay=true with the applauncher containmentaction
Summary: Currently NoDisplay services are shown, which doesn't make much sense.
Test Plan: Installed and looked through the menu, no excessive or duplicate items anymore.
Reviewers: Plasma, hein
Reviewed By: Plasma, hein
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D19157