Adjust KeyboardLayout to non-kded DBus service
Summary:
The keyboard layout kded module does also register a dedicated DBus
service and a dedicated object. By using the newer service name we
can also provide the same on Wayland where there is no kded module
for keyboard.
Test Plan: Not yet tested as I'm on Wayland
Reviewers: Plasma on Wayland
Subscribers: plasma-devel
Tags: Plasma on Wayland
Differential Revision: https://phabricator.kde.org/D4322