Fix: add _stop to geojson exported stop-points

IMPORTANT read release 0.5.9.8 as well

The latest improvements for geojson missed to have a type indicator for the geojson exported 'stop' element, which is used to create the entity name, i.e. it would show only "geojson_location.stopname". This makes it impossible to use customize_glob to add an entity picture as it cannot properly filter them out.
Now the entity name contains '_stop' at the end