[backport#15870 2/3] scripted-diff: Bump copyright headers in wallet

Summary:
-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./src/wallet/
-END VERIFY SCRIPT-

https://github.com/bitcoin/bitcoin/pull/15870/commits/aaaa57c2aad3a6278559ae3db5d953c847c6ffcb

Depends on D7014

Partial backport of Core PR15870

Test Plan:

none

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7015