Updated rviz file for grid map demo.
Updated rviz file for grid map demo.

ethz-asl/grid_map,uzh-rpg/grid_map,uzh-rpg/grid_map,chen0510566/grid_map,ANYbotics/grid_map,ethz-asl/grid_map,chen0510566/grid_map,ysonggit/grid_map,ANYbotics/grid_map,ysonggit/grid_map