[ecash-herald, Cashtab, explorer] chronik back to native1

Summary: chronik-native1 is indexed for agora and working. switch back to this server.

Test Plan:
proofread, ci tests

I confirmed with agora queries that it is indexed for agora

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D17482