Remove unused CarpetServer.rand field

Resolves #1429.

src/main/java/carpet/CarpetServer.java

@@ -3,7 +3,6 @@ package carpet;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Random;
 import java.util.Set;
 
 import carpet.commands.CounterCommand;
@@ -41,7 +40,6 @@ import net.minecraft.server.level.ServerPlayer;
 
 public class CarpetServer // static for now - easier to handle all around the code, its one anyways
 {
-    public static final Random rand = new Random();
     public static MinecraftServer minecraft_server;
     private static CommandDispatcher<CommandSourceStack> currentCommandDispatcher;
     public static CarpetScriptServer scriptServer;