Fix <1.12 schematic checking

Signed-off-by: Lixfel <agga-games@gmx.de>

FightSystem_Core/src/de/steamwar/fightsystem/fight/FightSchematic.java

@@ -150,7 +150,7 @@ public class FightSchematic extends StateDependent {
         );
         FightSystem.getHullHider().initialize(team);
         if(ArenaMode.Check.contains(Config.mode) && !team.isBlue())
-            replaceSync(Material.TNT, Material.RED_WOOL);
+            replaceSync(Material.TNT, Material.OBSIDIAN);
 
         Bukkit.getScheduler().runTaskLater(FightSystem.getPlugin(), freezer::disable, 3);
         Bukkit.getScheduler().runTaskLater(FightSystem.getPlugin(), team::teleportToSpawn, 40);