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According to the documentation there is no parameter scan_topic in gmapping. So the parameter will not do anything. The remapping seems to be correct.

I'm not sure why you need the scan information of the same lidar on a different topic. What you could easily do is to create a relay: rosrun topic_tools relay scan scan2

However, in the end, this would still be, more or less, subscribing to the same topic. This has nothing to do with your tf tree. Which looks strange, by the way. You have tree which is only connectet through the map topic. But I guess this comes from gmapping and the scan_matcher providing a /map->something transform, right?