Block savestates OSM when video frames are dumped.

Also make the dump messages shorter,
especially dump start since it will be recorded.

Windows/MainWindowMenu.cpp

@@ -447,7 +447,7 @@ namespace MainWindow {
 	}
 
 	static void SaveStateActionFinished(SaveState::Status status, const std::string &message, void *userdata) {
-		if (!message.empty()) {
+		if (!message.empty() && !g_Config.bDumpFrames) {
 			osm.Show(message, status == SaveState::Status::SUCCESS ? 2.0 : 5.0);
 		}
 		PostMessage(MainWindow::GetHWND(), WM_USER_SAVESTATE_FINISH, 0, 0);