Merge applet packages' /code subdirs into /ui subdirs
Summary:
As there are only a few QML files in the respective /ui subdir, having the
JS file in the same dir still provides good overview
Test Plan: Applets UI & Config still work as before
Reviewers: Plasma, mart, broulik, apol
Reviewed By: apol
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11145