[Extractor] Fix idle monitoring

Summary:
Resume events are only signaled when KIdleTime has been explicitly told
to do so.

Depends on D28862

Reviewers: Baloo, ngraham

Reviewed By: Baloo, ngraham

Subscribers: kde-frameworks-devel

Tags: Frameworks, Baloo

Differential Revision: https://phabricator.kde.org/D28863