Port 'Add To Addressbook' action to Akonadi::TagWidget
Summary:
They both look and behave the same, but Akonadi::TagWidget is the
"standard" widget used everywhere else.
Reviewers: mlaurent
Reviewed By: mlaurent
Subscribers: kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D29252