[Fix #3] Update basket sum after deleting an article

src/gui/mainwindow.cpp

@@ -322,6 +322,8 @@ void MainWindow::onCancelArticleButtonClicked([[maybe_unused]] bool checked)
     for (auto iter = indexes.constEnd() - 1; iter >= indexes.constBegin(); --iter) {
         ui_.basketView->model()->removeRow(iter->row());
     }
+
+    ui_.basketSumLabel->setText(marketplace_->getBasketSumAsString().c_str()); // Update basket sum
 }
 
 void MainWindow::onCancelSaleButtonClicked([[maybe_unused]] bool checked)