Fix change detection of imported internal descriptors

Summary:
Import internal descriptors were having address book entries added which meant they would be detected as non-change. Fix this and add a test for it.

This is a backport of core#20266

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10719