DRASCULA: Fixed Code to allow Quit/RTL Function and avoid Memory Leakage.

A memory leakage was traced down to a failure to call the engine destructor.
This was due to the engine directly calling OSystem quit() i.e. _system->quit(), rather than
just allowing engine::run() to return.
Have removed this code and implemented the changes required to allow graceful Quit/RTL to occur.

svn-id: r55583

engines/drascula/saveload.cpp

@@ -64,7 +64,7 @@ bool DrasculaEngine::saveLoadScreen() {
 	_system->setFeatureState(OSystem::kFeatureVirtualKeyboard, true);
 	setCursor(kCursorCrosshair);
 
-	for (;;) {
+	while (!shouldQuit()) {
 		y = 27;
 		copyBackground();
 		for (n = 0; n < NUM_SAVES; n++) {