Simplify Argument constructor chain

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

@@ -91,7 +91,7 @@ public class Argument<T> {
     private Function<String, String[]> tabCompletes;
 
     public Argument(Function<String, T> mapper, Predicate<T> constraint, String... tabCompletes) {
-        this(mapper, constraint, () -> tabCompletes);
+        this(mapper, constraint, s -> tabCompletes);
     }
 
     public Argument(Function<String, T> mapper, Predicate<T> constraint, Supplier<String[]> tabCompletes) {