Fix SWCommandUtils

SpigotCore_Main/src/de/steamwar/command/SWCommandUtils.java

@@ -120,7 +120,7 @@ public class SWCommandUtils {
         }
 
         if (varArgType != null) {
-            Object varArgument = arguments[args.length - 1];
+            Object varArgument = arguments[arguments.length - 1];
 
             for (int i = 0; i < length; i++) {
                 Object value = parameters[parameters.length - 1].map(commandSender, Arrays.copyOf(args, index), args[index]);