Workaround the touchpad toggle button not working

Summary: BUGS: 370588

Test Plan:
Without it the touchpad toggle at my laptop just toggles once
now it works fine all the time

Reviewers: davidedmundson, xuetianweng

Reviewed By: xuetianweng

Subscribers: knambiar, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D10498