Save unneeded DBus roundtrip
Summary: When the module is loaded the handler is notified over DBus just to go back to the module to init it. Skip the roundtrip and init directly.
Test Plan: Restarted plasmashell and kded5. (dis)connected wifi. Got notifications about it
Reviewers: Plasma, jgrulich
Reviewed By: jgrulich
Subscribers: davidedmundson, broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28698