send: don't allow fiat conversion if websocket is disabled

src/SendWidget.cpp

@@ -236,6 +236,10 @@ void SendWidget::updateConversionLabel() {
         return;
     }
 
+    if (config()->get(Config::disableWebsocket).toBool()) {
+        return;
+    }
+
     QString conversionAmountStr = [this]{
         QString currency = ui->comboCurrencySelection->currentText();
         if (currency != "XMR") {
@@ -331,6 +335,16 @@ void SendWidget::disableSendButton() {
     ui->btnSend->setEnabled(false);
 }
 
+void SendWidget::setWebsocketEnabled(bool enabled) {
+    this->updateConversionLabel();
+    if (enabled) {
+        this->setupComboBox();
+    } else {
+        ui->comboCurrencySelection->clear();
+        ui->comboCurrencySelection->insertItem(0, "XMR");
+    }
+}
+
 void SendWidget::onDataPasted(const QString &data) {
     if (!data.isEmpty()) {
         QVariantMap uriData = m_ctx->wallet->parse_uri_to_object(data);