Update chainparams

Summary: See title. Skipped testnet to avoid disrupting upgrade testnet chains.

Test Plan:
make check
TeamCity IBD (see comments).
Verify values against your own node.

Reviewers: #bitcoin_abc, deadalnix, Fabien, markblundeberg

Reviewed By: #bitcoin_abc, Fabien, markblundeberg

Subscribers: markblundeberg, Mengerian

Differential Revision: https://reviews.bitcoinabc.org/D3884