Fix space handling in export data script

[mszell]

"Exporting la data for Andorra"

[mszell]

Same for Athens

Exporting grid, betweenness_centrality
Traceback (most recent call last):
File "/Users/mszell/Github/BikeNetKit/dataexport/./scripts/growbikenet/exportalldata_onecity.py", line 58, in
gbn.growbikenet(
File "/Users/mszell/Github/BikeNetKit/dataexport/.pixi/envs/default/lib/python3.12/site-packages/growbikenet/growbikenet.py", line 136, in growbikenet
raise ValueError("export_file_format must be 'geojson' or 'gpkg'")
ValueError: export_file_format must be 'geojson' or 'gpkg'
Exporting geojson data for Municipality of Athens