Hotfix invert from Validator

src/de/steamwar/command/AbstractSWCommand.java

@@ -369,7 +369,11 @@ public abstract class AbstractSWCommand<T> {
 
             @Override
             public boolean validate(T sender, Object value, MessageSender messageSender) {
-                return inner.validate(sender, value, messageSender) ^ invert;
+                if (invert) {
+                    return !inner.validate(sender, value, messageSender);
+                } else {
+                    return inner.validate(sender, value, messageSender);
+                }
             }
         }
     }