Remove redundant locks
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

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