[josm_geochat] repair plugin + fix edt violation (fix #josm9636)

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30262 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
[josm_reltoolbox] see #josm8234 - remove duplicated icons

git-svn-id: http://svn.openstreetmap.org/applications/editors/josm/plugins@30264 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4