Merge #1540: export: list transaction in chronological order

3a99057 export: list transaction in chronological order (pythcoiner)

Pull request description:

  backport of #1537

ACKs for top commit:
  edouardparis:
    Self-ACK 3a99057

Tree-SHA512: 6ae1bb7b9a601cdb377af5a7ab091dfc8cf29bdefa7e7156b6c2f5dbce7810f69ecbdacd3c23b348bcc1812b7b1d9543830d2979db692cfb6df1db1ff6d091b1

liana-gui/src/export.rs

@@ -268,7 +268,7 @@ impl State {
                 }
 
                 let mut txs: Vec<_> = map.into_values().collect();
-                txs.sort_by(|a, b| a.compare(b));
+                txs.sort_by(|a, b| b.compare(a));
 
                 for mut tx in txs {
                     let date_time = tx