[josm_public_transport] see #josm8987 - update to JOSM 6173

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29861 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_public_transport] revert unneeded version change in fact

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29862 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4