Remove redundant locks
Summary:
- SetAddressBook(...) is locking cs_wallet internally
- DelAddressBook(...) is locking cs_wallet internally
Backport of PR11733
https://github.com/bitcoin/bitcoin/pull/11733
Test Plan:
make check
test_runner.py
Reviewers: jasonbcox, deadalnix, Fabien, O1 Bitcoin ABC, #bitcoin_abc
Reviewed By: jasonbcox, O1 Bitcoin ABC, #bitcoin_abc
Subscribers: teamcity, schancel
Differential Revision: https://reviews.bitcoinabc.org/D2700