Fix ConcurrentModificationException

I don't know, if that's the best way to fix it, but the error seems to
be gone.

src/de/xite/scoreboard/modules/board/ScoreboardManager.java

@@ -201,7 +201,9 @@ public void run() {
 						int i = scores.size()-id-1;
 						currentScores.replace(id, score);
 
-						for(Player p : players)
+						List<Player> all = new ArrayList<Player>();
+						all.addAll(players);
+						for(Player p : all)
 							ScoreTitleUtils.setScore(p, score, i, true, get(name)); // set the score
 
 						if(count >= scores.get(id).size()-1) {