[cashtab + ecash-herald + explorer] revert to previous chronik instance ordering
Summary:
With chronik-native1 indexed, back out the temporary swaps
Open review question -- mb we should have some apps default to 2, others to 1
Test Plan: Confirm chronik-native1 is the first server for all apps, as was the original case.
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Subscribers: Fabien
Differential Revision: https://reviews.bitcoinabc.org/D16585