[Baloo KCM] Expose "Index hidden" config setting
Summary:
Also inset both "Index file content" and "Index hidden" so it is more
obvious both are subordinate to the global "Enable indexing".
Reviewers: Baloo, VDG, ngraham
Reviewed By: Baloo, VDG, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28024