Bug fix: Tell the buffer we're using a dedicated thread (#1183)

nav2_bt_navigator/src/bt_navigator.cpp

@@ -59,6 +59,7 @@ BtNavigator::on_configure(const rclcpp_lifecycle::State & /*state*/)
   auto timer_interface = std::make_shared<tf2_ros::CreateTimerROS>(
     get_node_base_interface(), get_node_timers_interface());
   tf_->setCreateTimerInterface(timer_interface);
+  tf_->setUsingDedicatedThread(true);
   tf_listener_ = std::make_shared<tf2_ros::TransformListener>(*tf_, this, false);
 
   goal_sub_ = create_subscription<geometry_msgs::msg::PoseStamped>(