fix(dummy_perception): fix ns and topic

[taikitanaka3]

Related Issue(required)

tier4/autoware_launch-old#164 (comment)

Description(required)

fix dummy perception publisher topic to latest

Review Procedure(required)

launch psim and see occupancy grid is published by

/perception/occupancy_grid_map/map

Related PR(optional)

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[wep21]

LGTM