[topological_utils/node_metadata.py] requires `map_name`

[marc-hanheide]

Current the query for node meta data requires to set a map_name in the query string. However, the current map is not known to the user...
Either it

• should be removed from the query and just the topo name being used (which would make sense in my view), and/or
• it should be left empty when the current map is used (same for the topo map name, actually), and/or
• the current gridmap name should be published or set as a rosparam (least favourable) by topo-nav, maybe

Whatever you choose, I want this to get rid of the hardcoded name in https://github.com/strands-project/strands_hri/blob/hydro-devel/bellbot_gui/scripts/server.py#L121

[Jailander]

yes I think the map name in that query makes no sense I'll remove asap.

[Jailander]

can we close this? I think its fixed now