added namespace for costmap (#28)

Co-authored-by: andriimaistruk <andriy.maistruk>

Author: andriimaistruk

nav2_bringup/bringup/params/forklift_params.yaml

@@ -234,7 +234,7 @@ local_costmap:
       update_frequency: 3.0
       publish_frequency: 3.0
       robot_base_frame: base_link
-      map_topic: /costmap_node/map
+      map_topic: costmap_node/map
       rolling_window: True
       width: 7
       height: 7
@@ -468,7 +468,7 @@ global_costmap:
       robot_base_frame: base_link
       use_sim_time: False
       footprint: "[[1.51, 0.45], [1.51, -0.45], [-0.35, -0.45], [-0.35, 0.45]]"
-      map_topic: /costmap_node/map
+      map_topic: costmap_node/map
       track_unknown_space: false
       plugins: ["static_layer", "obstacle_layer", "inflation_layer"]
       obstacle_layer: