[josm_reverter] update to JOSM 6798

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30258 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
Fix transmitting traces, that were never saved to a file, for example,
created by the EditGPX plugin.


git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30260 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4