Remove the shutdown notice.
Summary:
According to https://blog.libravatar.org/posts/Libravatar.org_is_not_going_away/,
libravatar didn't (and won't) go away.
Reviewers: mlaurent
Reviewed By: mlaurent
Subscribers: kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D16892