CW-983-SwapTrade-enhancements (#2057)

* Update swaptrade_exchange_provider.dart

* fix network and trade state issues

* Update trade_filter_store.dart

* hopefully final changes :3

* re-enable swaptrade [skip ci]

* fix rate calculation issue

* Add refund address

---------

Co-authored-by: OmarHatem <omarh.ismail1@gmail.com>

lib/entities/default_settings_migration.dart

@@ -401,6 +401,13 @@ Future<void> defaultSettingsMigration(
             enabled: false,
           );
 			    break;
+        case 48:
+          _changeExchangeProviderAvailability(
+            sharedPreferences,
+            providerName: "SwapTrade",
+            enabled: true,
+          );
+			    break;
         default:
           break;
       }