Fixed OnResourceDestroy callback not called by the destructor

Former-commit-id: 8b961101f88343ddd3bb382d2c333052efb03164

src/Nazara/Utility/SkeletalMesh.cpp

@@ -182,6 +182,8 @@ void NzSkeletalMesh::Destroy()
 {
 	if (m_impl)
 	{
+		NotifyDestroy();
+
 		delete m_impl;
 		m_impl = nullptr;
 	}