Kraken: the last section of a journey between two stop point was false

For coherence we change the last section of a journey, but have to do
this only for the street_network section, we don't want to change
the TC section. In a direct journey between two stop_point we only have
one section, so we modify this one and it was bad.

http://jira.canaltp.fr/browse/NAVITIAII-1323