Fix bug #1778257, 'Track loading counts for the race start counter in the trunk'

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1360 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/game_manager.cpp

@@ -69,7 +69,7 @@ void GameManager::run()
         // Now the screen may have changed and
         // needs to be updated.
         if(m_started) m_prev_time = m_curr_time;
-        else
+        else if( race_manager->raceIsActive() )
         {
             m_prev_time = SDL_GetTicks();
             m_started = true;