Add option for shortcut visibility in context menus

Fixes: QTCREATORBUG-22502
Change-Id: I49587a6a8b575a3a1453104a829cd91ad3566d7e
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/coreplugin/mainwindow.cpp

@@ -149,6 +149,8 @@ MainWindow::MainWindow()
     }
 
     QApplication::setStyle(new ManhattanStyle(baseName));
+    m_generalSettings->setShowShortcutsInContextMenu(
+        m_generalSettings->showShortcutsInContextMenu());
 
     setDockNestingEnabled(true);