Remove criptolayer.net from seeder lists

Summary:
criptolayer.net seeder is being decomm'd: https://github.com/Bitcoin-ABC/bitcoin-abc/issues/336
dig seeder.criptolayer.net already returns no servers reached.

Test Plan: make check

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D3639