avoid showing usb signing dialog for watch only keystores in multisig wallets

src/main/java/com/sparrowwallet/sparrow/transaction/HeadersController.java

@@ -752,7 +752,8 @@ public class HeadersController extends TransactionFormController implements Init
 
     private void initializeSignButton(Wallet signingWallet) {
         Optional<Keystore> softwareKeystore = signingWallet.getKeystores().stream().filter(keystore -> keystore.getSource().equals(KeystoreSource.SW_SEED)).findAny();
-        Optional<Keystore> usbKeystore = signingWallet.getKeystores().stream().filter(keystore -> keystore.getSource().equals(KeystoreSource.HW_USB) || keystore.getSource().equals(KeystoreSource.SW_WATCH)).findAny();
+        Optional<Keystore> usbKeystore = signingWallet.getKeystores().stream()
+                .filter(keystore -> keystore.getSource().equals(KeystoreSource.HW_USB) || (signingWallet.getKeystores().size() == 1 && keystore.getSource().equals(KeystoreSource.SW_WATCH))).findAny();
         Optional<Keystore> bip47Keystore = signingWallet.getKeystores().stream().filter(keystore -> keystore.getSource().equals(KeystoreSource.SW_PAYMENT_CODE)).findAny();
         if(softwareKeystore.isEmpty() && usbKeystore.isEmpty() && bip47Keystore.isEmpty()) {
             signButton.setDisable(true);
@@ -989,7 +990,8 @@ public class HeadersController extends TransactionFormController implements Init
 
         List<String> fingerprints = headersForm.getSigningWallet().getKeystores().stream().map(keystore -> keystore.getKeyDerivation().getMasterFingerprint()).collect(Collectors.toList());
         List<Device> signingDevices = AppServices.getDevices().stream().filter(device -> fingerprints.contains(device.getFingerprint())).collect(Collectors.toList());
-        if(signingDevices.isEmpty() && headersForm.getSigningWallet().getKeystores().stream().noneMatch(keystore -> keystore.getSource().equals(KeystoreSource.HW_USB) || keystore.getSource().equals(KeystoreSource.SW_WATCH))) {
+        if(signingDevices.isEmpty() && headersForm.getSigningWallet().getKeystores().stream()
+                .noneMatch(keystore -> keystore.getSource().equals(KeystoreSource.HW_USB) || (headersForm.getSigningWallet().getKeystores().size() == 1 && keystore.getSource().equals(KeystoreSource.SW_WATCH)))) {
             return;
         }