This fixes a regression introduced by 47f76da4

Closes #159

Journeys logged with travelynx v2.8.0 through 2.8.30 are affected by this bug
and will contain incorrect data even after applying this patch – it only
fixes data for new entries.

To Do: See if affected entries can be repaired with a DB migration

Closes #155

Patch by @networkException, thanks!

Closes #158

Oh NASA/HAVAG, you so weird

Closes #156

References #156

These backends do not provide trip/journey details, making them useless for
travelynx

The IRIS route may differ from the HAFAS route in case of diversions,
causing travelynx to lose real-time data, coordinates, and polyline when
the follow-up add_route_timestamps call is not made.