Actual faster LinkedHashSet tail (#2726)

My profuse apologies - in the last PR I somehow realised and then forgot
that LinkedHashSet tail doesn't actually use LinkedHashMap tail. This
remedies that.

vavr/src/main/java/io/vavr/collection/LinkedHashSet.java

@@ -841,7 +841,7 @@ public LinkedHashSet<T> tail() {
         if (map.isEmpty()) {
             throw new UnsupportedOperationException("tail of empty set");
         }
-        return remove(head());
+        return wrap(map.tail());
     }
 
     @Override