VehicleJourneysCtl#collection: Sort journeys by departure time ascending

Correctly sort journeys. They used to be sorted correctly this way, but
after d7c6d5ce602219b9bfa47686542dd575f1fe2e50 or
c3d207301d17538b65d2a1239ce0acf642942ce9, the sorting got messed up
because of the join.

Here we leverage `journey_patterns.departure_stop_point_id` in order to
get the first stop and sort by that stop's departure time. Query
solution thanks to Luc and Alban, who remembered that a reference to the
first stop point is stored so we can leverage that for complex things
like this.

Refs #3268

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