Erling Haaland scored in his last match for Borussia Dortmund on Saturday and Robert Lewandowski’s successful header in the season finale could have also been his last for champions Bayern Munich as the Bundesliga faces losing both superstars. Manchester City-bound Haaland converted a penalty as Dortmund fought to a 2-1 comeback victory against Hertha Berlin who now face a tense relegation play-off tie because VfB Stuttgart moved ahead of them into safety with an injury-time 2-1 against Cologne from Wataru Endo. Lewandowski headed Munich 2-0 ahead before they were held 2-2 at Wolfsburg, and, a…