[backport#17237 1/2] wallet: Lock address type in ReserveDestination

Summary:
https://github.com/bitcoin/bitcoin/pull/17237/commits/55295fba4cbff36e9a8c3fed9c38e82ebe3c48b7

Partial backport of Core PR17237

Test Plan:

ninja check check-functional

Reviewers: #bitcoin_abc, jasonbcox, deadalnix

Reviewed By: #bitcoin_abc, jasonbcox, deadalnix

Subscribers: jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D7689