### Describe the issue

bitcoin-qt: Debug pop-up window, Peers tab, right-click ban node for 1 hour, day, week, year does nothing. Disconnect node still works.
### Is the issue reproducible?

Yes.
#### List steps to reproduce below:
1. build master branch after commit https://github.com/bitcoin/bitcoin/commit/6423116741de2144872389cf63a621539ae79aaa
2. launch bitcoin-qt (on testnet is advisable)
3. test ban node list right-click functionality on Menu->Help->Debug pop-up window, Peers tab.

{
    clientModel = model;
    ui->trafficGraph->setClientModel(model);
    if (model && clientModel->getPeerTableModel() && clientModel->getBanTableModel()) {
        
        setNumConnections(model->getNumConnections());
        connect(model, SIGNAL(numConnectionsChanged(int)), this, SLOT(setNumConnections(int)));
        setNumBlocks(model->getNumBlocks(), model->getLastBlockDate(), model->getVerificationProgress(NULL), false);
        connect(model, SIGNAL(numBlocksChanged(int,QDateTime,double,bool)), this, SLOT(setNumBlocks(int,QDateTime,double,bool)));
        updateTrafficStats(model->getTotalBytesRecv(), model->getTotalBytesSent());
        connect(model, SIGNAL(bytesChanged(quint64,quint64)), this, SLOT(updateTrafficStats(quint64, quint64)));
        connect(model, SIGNAL(mempoolSizeChanged(long,size_t)), this, SLOT(setMempoolSize(long,size_t)));
        
        ui->peerWidget->setModel(model->getPeerTableModel());
        ui->peerWidget->verticalHeader()->hide();
        ui->peerWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);
        ui->peerWidget->setSelectionBehavior(QAbstractItemView::SelectRows);
        ui->peerWidget->setSelectionMode(QAbstractItemView::SingleSelection);
        ui->peerWidget->setContextMenuPolicy(Qt::CustomContextMenu);