Query more trips later and earlier results in no new trips

[ialokim]

Describe the bug
When querying trips/searching connections and then looking for later AND earlier results, the latter ones are only shown after twice swiping in that direction. Most probably, only the last trip context is retained instead of a combined one (containing currently shown earliest departure and last arrival time).

To Reproduce
Steps to reproduce the behavior:

1. Search a trip.
2. Scroll down below the list to load later trips.
3. Scroll up above the list to load earlier trips.
4. Note that no new trips are added/trips are doubled depending on the network provider implementation.

Versions:

• Transportr Version: 2.1.4

Also refer to https://gitlab.com/opentransitmap/public-transport-enabler/-/merge_requests/10#note_1053067739