Incorrect sort order in sortOrders function

[raladev]

xud/lib/utils/utils.ts

Line 197 in aa41615

export const sortOrders = <T extends SortableOrder>(orders: T[], isBuy: boolean): T[] => {

based on #1883 (review)

[kilrau]

Since this is a breaking, non-trivial change that only appears on the gRPC and #1883 fixed the only place in the xucli where this surfaces, I'm inclined to not touch this any time soon :/