qt: Use | instead of + for key modifiers

This change is preparation for Qt 6 where `+` has been deprecated, and
it fixes an experimental build with Qt 6.2.4.

Author: hebasto

src/qt/bitcoingui.cpp

@@ -356,7 +356,7 @@ void BitcoinGUI::createActions()
     showHelpMessageAction->setStatusTip(tr("Show the %1 help message to get a list with possible Bitcoin command-line options").arg(PACKAGE_NAME));
 
     m_mask_values_action = new QAction(tr("&Mask values"), this);
-    m_mask_values_action->setShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_M));
+    m_mask_values_action->setShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_M));
     m_mask_values_action->setStatusTip(tr("Mask the values in the Overview tab"));
     m_mask_values_action->setCheckable(true);
 
@@ -427,8 +427,8 @@ void BitcoinGUI::createActions()
     }
 #endif // ENABLE_WALLET
 
-    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_C), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindowActivateConsole);
-    connect(new QShortcut(QKeySequence(Qt::CTRL + Qt::SHIFT + Qt::Key_D), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindow);
+    connect(new QShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_C), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindowActivateConsole);
+    connect(new QShortcut(QKeySequence(Qt::CTRL | Qt::SHIFT | Qt::Key_D), this), &QShortcut::activated, this, &BitcoinGUI::showDebugWindow);
 }
 
 void BitcoinGUI::createMenuBar()