[kcm] Drop 'Enable bluetooth integration' setting
Summary: It controls whether the bluedevil kded module is loaded. I don't see any use case for it. If one really really needs to disable the kded module this can be done from the kded KCM.
Reviewers: Plasma, drosca
Reviewed By: drosca
Subscribers: broulik, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D27572