Move applet packages' /code subdirs below /ui subdirs
Summary:
As there are quite a bit QML files in the respective /ui subdir, having the
JS file in another separate subdir named /code as befire provides
good overview
Test Plan: Applets UI & Config still work as before
Reviewers: Plasma, mart, broulik, hein
Reviewed By: Plasma, mart
Subscribers: apol, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11148