Log why the config is being saved (we seem to do it a bit much at times)

UI/TouchControlLayoutScreen.cpp

@@ -286,7 +286,7 @@ void TouchControlLayoutScreen::resized() {
 }
 
 void TouchControlLayoutScreen::onFinish(DialogResult reason) {
-	g_Config.Save();
+	g_Config.Save("TouchControlLayoutScreen::onFinish");
 }
 
 UI::EventReturn TouchControlLayoutScreen::OnVisibility(UI::EventParams &e) {