The `identity_doc_at` and `identity_doc` methods on `ReadRepository`
returned the unverified identity document. Every usage of these
methods would always verify the document after.
Simplify the code by calling verified in the methods and directly return the
verified identity document.
Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett