Fix duplicate QR codes when remote signature instructions opened repeatedly

src/js/main.js

@@ -120,6 +120,7 @@ function activateNotarySignaturePad() {
 function signatureRemoteModalOpen() {
     var url = getSignatureServerUrl();
     $("#signatureRemoteUrlLabel").text(url);
+    $("#signatureRemoteQRCode").html("");
     new QRCode(document.getElementById("signatureRemoteQRCode"), url);
     new bootstrap.Modal(document.getElementById('signatureRemoteModal')).show();
 }