Just save the current config every time the config file is switched

also undo #7473 because it would now introduce redundant writes.

Core/System.cpp

@@ -230,7 +230,6 @@ void CPU_Init() {
 
 	if (coreParameter.updateRecent) {
 		g_Config.AddRecent(filename);
-		g_Config.Save();
 	}
 
 	coreState = coreParameter.startPaused ? CORE_STEPPING : CORE_RUNNING;