Revert "Update difficulty"

This reverts commit 47c8cb1701.

LobbySystem/src/de/steamwar/lobby/listener/PlayerSpawn.java

@@ -26,7 +26,6 @@ import de.steamwar.lobby.util.ItemBuilder;
 import de.steamwar.network.NetworkSender;
 import de.steamwar.network.packets.client.ImALobbyPacket;
 import org.bukkit.Bukkit;
-import org.bukkit.Difficulty;
 import org.bukkit.GameMode;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
@@ -53,7 +52,6 @@ public class PlayerSpawn extends BasicListener {
     public void onJoin(PlayerJoinEvent e) {
         Player player = e.getPlayer();
         e.setJoinMessage(null);
-        player.getWorld().setDifficulty(Difficulty.HARD);
 
         player.setGameMode(GameMode.SURVIVAL);
         player.setWalkSpeed(0.5f);