Better Ledger Connection handling (#1802)

lib/monero/cw_monero.dart

@@ -402,6 +402,10 @@ class CWMonero extends Monero {
     moneroWallet.setLedgerConnection(connection);
   }
 
+  void resetLedgerConnection() {
+    disableLedgerExchange();
+  }
+
   @override
   void setGlobalLedgerConnection(ledger.LedgerConnection connection) {
     gLedger = connection;

lib/view_model/hardware_wallet/ledger_view_model.dart

@@ -98,7 +98,9 @@ abstract class LedgerViewModelBase with Store {
         print('Ledger Device State Changed: $event');
         if (event == sdk.BleConnectionState.disconnected) {
           _connection = null;
-          _connectionChangeListener?.cancel();
+          if (type == WalletType.monero) {
+            monero!.resetLedgerConnection();
+          }
         }
       });
     }