revalidate the send amount when payments are set from a uri opened externally or a spend event so insufficient and dust warnings show

src/main/java/com/sparrowwallet/sparrow/wallet/PaymentController.java

@@ -749,6 +749,7 @@ public class PaymentController extends WalletFormController implements Initializ
             }
             if(payment.getAmount() >= 0) {
                 setRecipientValueSats(payment.getAmount());
+                revalidateAmount();
             }
             setFiatAmount(AppServices.getFiatCurrencyExchangeRate(), payment.getAmount());
         }