use path to open json file (sales)

src/gui/mainwindow.cpp

@@ -439,9 +439,11 @@ void MainWindow::onImportSalesJsonActionTriggered()
     if (filename.isEmpty())
         return;
 
+    std::filesystem::path filePath(filename.toStdWString());
+
     delete ui_.salesView->model();
     try {
-        JsonUtil::importSales(filename.toStdString(), marketplace_.get(),
+        JsonUtil::importSales(filePath, marketplace_.get(),
                               settings.value("global/cashPointNo").toInt());
     } catch (std::runtime_error& err) {
         QMessageBox(QMessageBox::Icon::Warning, "Import nicht möglich", err.what(), QMessageBox::Ok,