fix disconnection in setParameterContainer

GUI/View/Tuning/ParameterBackupWidget.cpp

@@ -97,7 +97,7 @@ void ParameterBackupWidget::setParameterContainer(ParameterContainerItem* contai
     m_container = container;
 
     // new snapshot
-    disconnect(m_create);
+    m_create->disconnect();
     connect(m_create, &QPushButton::clicked, [this] {
         QString newName;
         NewSnapshotDialog dialog(newName);
@@ -110,7 +110,7 @@ void ParameterBackupWidget::setParameterContainer(ParameterContainerItem* contai
     });
 
     // delete snapshot
-    disconnect(m_remove);
+    m_remove->disconnect();
     connect(m_remove, &QPushButton::clicked, [this] {
         if (m_combo->currentIndex() >= 0) {
             m_container->deleteBackupValues(m_combo->currentIndex());