Fix stop matching for DBRIS polylines

This patch fixes matching stops by name to route indices
for DBRIS polylines.

The format returned by
Travel::Status::DE::DBRIS::Journey is slightly different to
Travel::Status::DE::HAFAS::Journey, as it assigns a whole
`stop` to a polyline coordinate, instead of `name` and `eva`.

This fixes the train following train marker actually following
DBRIS polylines.