[Cashtab] Sort OrderBook by price and then min buy amounts
Summary:
Some listings e.g. XECX have different listings at the same price. In this case, the sort is random.
Apply a second dimension sort of the min buy amount to distinguish between these listings.
Test Plan:
npm test, I did not add a specific test for this sort bc it is basically a JS primitive, can visit test site and see XECX listing page
deployed here
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D17419