table: delete unnecessary name_tree::Iterator destructor

refs #3687

Change-Id: Iccb755c0b1234d31bea84797db348fd229b2fde9
diff --git a/daemon/table/name-tree-iterator.hpp b/daemon/table/name-tree-iterator.hpp
index fcc57b1..f484440 100644
--- a/daemon/table/name-tree-iterator.hpp
+++ b/daemon/table/name-tree-iterator.hpp
@@ -74,9 +74,6 @@
 
   Iterator(shared_ptr<EnumerationImpl> impl, const Entry* ref);
 
-  virtual
-  ~Iterator() = default;
-
   const Entry&
   operator*() const
   {