fix tests for indexed messages and frames

index_length changes index a bit
but from now on changes to layouts should push the index automatically
just have to set the index while calling now

test/parfait/test_attributes.rb

@@ -17,7 +17,7 @@ class TestAttributes < MiniTest::Test
   end
   def test_message_name_nil
     last = @layout.instance_names.last
-    assert_equal :name , last
+    assert_equal :indexed_length , last
     assert_equal nil , @mess.name
   end
   def test_message_next_set