Bech32 addresses in dumpwallet

Summary:
Output bech32 addresses in dumpwallet if address type is not as legacy

This is a backport of Core PR12315 (without the Segwit bits).

Test Plan:

make check

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D3663