Update chainparams

Summary: See title.

Test Plan:
make check
+ TeamCity IBD

Reviewers should verify these hashes against their own nodes.

Reviewers: #bitcoin_abc, deadalnix, Fabien, markblundeberg

Reviewed By: #bitcoin_abc, deadalnix, Fabien, markblundeberg

Subscribers: markblundeberg

Differential Revision: https://reviews.bitcoinabc.org/D3653