dispatcher: minor changes

src/entt/signal/dispatcher.hpp

@@ -122,7 +122,7 @@ class basic_dispatcher {
 
     using alloc_traits = std::allocator_traits<Allocator>;
     using container_allocator = typename alloc_traits::template rebind_alloc<std::pair<const key_type, mapped_type>>;
-    using container_type = dense_map<id_type, mapped_type, identity, std::equal_to<id_type>, container_allocator>;
+    using container_type = dense_map<key_type, mapped_type, identity, std::equal_to<key_type>, container_allocator>;
 
     template<typename Type>
     [[nodiscard]] handler_type<Type> &assure(const id_type id) {