[#185] Use correct object size when object is combined or encrypted

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/handler/object_list.go

@@ -198,6 +198,10 @@ func fillContents(src []*data.ObjectInfo, encode string, fetchOwner bool) []Obje
 			ETag:         obj.HashSum,
 		}
 
+		if size, err := layer.GetObjectSize(obj); err == nil {
+			res.Size = size
+		}
+
 		if fetchOwner {
 			res.Owner = &Owner{
 				ID:          obj.Owner.String(),