Revert "refactor: Remove never used default parameter"

This reverts commit 7d0a8f4f53.

src/qt/bitcoingui.cpp

@@ -1027,7 +1027,7 @@ void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVer
     progressBar->setToolTip(tooltip);
 }
 
-void BitcoinGUI::message(const QString& title, QString message, unsigned int style)
+void BitcoinGUI::message(const QString& title, QString message, unsigned int style, bool* ret)
 {
     // Default title. On macOS, the window title is ignored (as required by the macOS Guidelines).
     QString strTitle{PACKAGE_NAME};
@@ -1081,7 +1081,9 @@ void BitcoinGUI::message(const QString& title, QString message, unsigned int sty
         showNormalIfMinimized();
         QMessageBox mBox(static_cast<QMessageBox::Icon>(nMBoxIcon), strTitle, message, buttons, this);
         mBox.setTextFormat(Qt::PlainText);
-        mBox.exec();
+        int r = mBox.exec();
+        if (ret != nullptr)
+            *ret = r == QMessageBox::Ok;
     } else {
         notificator->notify(static_cast<Notificator::Class>(nNotifyIcon), strTitle, message);
     }

src/qt/bitcoingui.h

@@ -219,8 +219,9 @@ public Q_SLOTS:
        @param[in] message   the displayed text
        @param[in] style     modality and style definitions (icon and used buttons - buttons only for message boxes)
                             @see CClientUIInterface::MessageBoxFlags
+       @param[in] ret       pointer to a bool that will be modified to whether Ok was clicked (modal only)
     */
-    void message(const QString& title, QString message, unsigned int style);
+    void message(const QString& title, QString message, unsigned int style, bool* ret = nullptr);
 
 #ifdef ENABLE_WALLET
     void setCurrentWallet(WalletModel* wallet_model);