Move LogWindow/LogConfigWindow destructor logic -> OnClose

Fixes the issue on macOS where quitting Dolphin from the Dock causes a
crash report (https://bugs.dolphin-emu.org/issues/9794). I'm not
exactly sure why this works, but it feels right and it turns out to fix
the problem.

Source/Core/DolphinWX/LogConfigWindow.cpp

@@ -25,13 +25,14 @@ LogConfigWindow::LogConfigWindow(wxWindow* parent, wxWindowID id)
               _("Log Configuration")),
       enableAll(true)
 {
+  Bind(wxEVT_CLOSE_WINDOW, &LogConfigWindow::OnClose, this);
   SetMinSize(wxSize(100, 100));
   m_LogManager = LogManager::GetInstance();
   CreateGUIControls();
   LoadSettings();
 }
 
-LogConfigWindow::~LogConfigWindow()
+void LogConfigWindow::OnClose(wxCloseEvent& event)
 {
   SaveSettings();
 }