Qt: Fix log / log config window not being marked as hidden when closing

Source/Core/DolphinQt2/Config/LogWidget.h

@@ -12,6 +12,7 @@
 #include "Common/Logging/LogManager.h"
 
 class QCheckBox;
+class QCloseEvent;
 class QComboBox;
 class QPushButton;
 class QVBoxLayout;
@@ -25,6 +26,9 @@ public:
   explicit LogWidget(QWidget* parent = nullptr);
   ~LogWidget();
 
+protected:
+  void closeEvent(QCloseEvent*) override;
+
 private:
   void UpdateLog();
   void UpdateFont();