Pass in smart fee slider value to coin control dialog

Since cfe77ef41 the global nTxConfirmTarget wasn't being updated by the smart
fee slider and thus the coin control dialog and labels were not being updated.

src/qt/coincontroldialog.cpp

@@ -510,7 +510,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
                 nBytes -= 34;
 
         // Fee
-        nPayFee = CWallet::GetMinimumFee(nBytes, nTxConfirmTarget, ::mempool, ::feeEstimator);
+        nPayFee = CWallet::GetMinimumFee(nBytes, coinControl->nConfirmTarget, ::mempool, ::feeEstimator);
 
         if (nPayAmount > 0)
         {
@@ -588,7 +588,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
     if (payTxFee.GetFeePerK() > 0)
         dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), payTxFee.GetFeePerK()) / 1000;
     else {
-        dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), ::feeEstimator.estimateSmartFee(nTxConfirmTarget, NULL, ::mempool).GetFeePerK()) / 1000;
+        dFeeVary = (double)std::max(CWallet::GetRequiredFee(1000), ::feeEstimator.estimateSmartFee(coinControl->nConfirmTarget, NULL, ::mempool).GetFeePerK()) / 1000;
     }
     QString toolTip4 = tr("Can vary +/- %1 satoshi(s) per input.").arg(dFeeVary);
 

src/qt/sendcoinsdialog.cpp

@@ -822,6 +822,12 @@ void SendCoinsDialog::coinControlUpdateLabels()
     // set pay amounts
     CoinControlDialog::payAmounts.clear();
     CoinControlDialog::fSubtractFeeFromAmount = false;
+    if (ui->radioSmartFee->isChecked()) {
+        CoinControlDialog::coinControl->nConfirmTarget = ui->sliderSmartFee->maximum() - ui->sliderSmartFee->value() + 2;
+    } else {
+        CoinControlDialog::coinControl->nConfirmTarget = model->getDefaultConfirmTarget();
+    }
+
     for(int i = 0; i < ui->entries->count(); ++i)
     {
         SendCoinsEntry *entry = qobject_cast<SendCoinsEntry*>(ui->entries->itemAt(i)->widget());