fix typo

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29957 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_elevationprofile]: Support GPX files with multiple tracks/routes

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@29958 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4