Summary:
now that KWayland is a framework, it's used directly from
Dialog, no need to inject kwayland usage from here anymore
Test Plan: Dialogs still have shadows and still move under wayland
Reviewers: #plasma, graesslin
Reviewed By: #plasma, graesslin
Subscribers: graesslin, plasma-devel
Tags: #plasma
Differential Revision: https://phabricator.kde.org/D3024