Fix All Dungeons being ended

When triggering the End Sign with Redstone etc

src/main/java/io/github/dre2n/dungeonsxl/sign/EndSign.java

@@ -77,7 +77,7 @@ public class EndSign extends DSign {
 
     @Override
     public void onTrigger() {
-        for (DGamePlayer dPlayer : plugin.getDPlayers().getDGamePlayers()) {
+        for (DGamePlayer dPlayer : DGamePlayer.getByWorld(getGameWorld().getWorld())) {
             dPlayer.finish();
         }
     }