[applets] Show battery monitor on all platforms and not just desktop
Summary:
This will also enable battery monitor on mobile.
See also: https://phabricator.kde.org/D2411
Reviewers: broulik, Plasma, graesslin
Reviewed By: Plasma, graesslin
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D2412