Fix ksysguard acpi cooling devices
Summary: The cooling devices state never changed from zero. It was wrongly calculated as a fraction from 0 to 1, instead of a percentage.
Reviewers: davidedmundson
Reviewed By: davidedmundson
Subscribers: ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24998