Do addmultisigaddress tests in legacy wallet mode in wallet_address_types.py
Summary:
addmultisigaddress is not available in descriptor wallets, so only run these when testing legacy wallets
This is a backport of core#18788 [8/15]
https://github.com/bitcoin/bitcoin/pull/18788/commits/59d3da5bce4ebd9c2291d8f201a53ee087938b21
Test Plan: test/functional/test_runner.py wallet_address_types
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D10664