Fix bugs, improve map

Summary:

• Lower batch size of trips to download
• Add Iveco name
• Filter better the trips, do not ask for null ones
• Do not zoom on position if the bottom sheet is open

Fix T1443

Thanks to Federica Esposito for testing

Test Plan:
Open the map and:

• before location is updated, click on a stop or on a bus: the map should not zoom on the user position any more
• pause the app, do something else
• reopen the app and check that there are no explosions or weird stuff

Reviewers: Libre BusTO hackers, valerio.bozzolan

Reviewed By: Libre BusTO hackers, valerio.bozzolan

Subscribers: valerio.bozzolan

Project Tags: Libre BusTO

Maniphest Tasks: T1443

Differential Revision: https://gitpull.it/D248