fix: simplify use_count comparison

opennurbs_mesh.cpp

@@ -14833,7 +14833,7 @@ bool ON_MeshCache::Transform(
       continue;
     // NOTE: use_count() == 1 is an approximation in multi-threaded environments
     // https:// en.cppreference.com/w/cpp/memory/shared_ptr/unique
-    if (false == item->m_mesh_sp.use_count() == 1)
+    if (item->m_mesh_sp.use_count() != 1)
     {
       // make a copy and transform the copy
       std::shared_ptr<ON_Mesh>(new ON_Mesh(*mesh)).swap(item->m_mesh_sp);