Core: Fix compilation warning

src/plugins/coreplugin/dialogs/shortcutsettings.cpp

@@ -116,6 +116,7 @@ void ShortcutSettings::finish()
 
 bool ShortcutSettings::eventFilter(QObject *o, QEvent *e)
 {
+    Q_UNUSED(o);
     if ( e->type() == QEvent::KeyPress ) {
         QKeyEvent *k = static_cast<QKeyEvent*>(e);
         handleKeyEvent(k);