fix payment card change. fix adding a new payment card

lib/presentation/event/payment_method_sheet_event.dart

@@ -4,9 +4,9 @@ sealed class PaymentMethodSheetEvent {}
 
 class PaymentMethodSheetStarted extends PaymentMethodSheetEvent {}
 
-class AddCardButtonPressed extends PaymentMethodSheetEvent {}
-
 class SelectPaymentCardRequested extends PaymentMethodSheetEvent {
   final PaymentCard card;
   SelectPaymentCardRequested(this.card);
 }
+
+class AddPaymentCardRequested extends PaymentMethodSheetEvent {}