gui: sort events and txs after push in the list

when a pending tx is confirmed, it is pushed in the
HistoryTransaction list at the end. It should be first
in the list. We sort now the list in order to make sure
it will be always the case.

gui/src/app/state/mod.rs

@@ -180,6 +180,7 @@ impl State for Home {
                             self.events.push(event);
                         }
                     }
+                    self.events.sort_by(|a, b| b.time.cmp(&a.time));
                 }
             },
             Message::PendingTransactions(res) => match res {

gui/src/app/state/transactions.rs

@@ -100,6 +100,7 @@ impl State for TransactionsPanel {
                             self.txs.push(tx);
                         }
                     }
+                    self.txs.sort_by(|a, b| b.time.cmp(&a.time));
                 }
             },
             Message::PendingTransactions(res) => match res {