Route overview excludes destination pin

[1ec5]

The logic for fitting the route to the map preview doesn’t account for the fact that the destination pin extends above the destination coordinate. There needs to be some additional top padding as long as the destination is toward the north. The issue is mitigated somewhat by the padding applied on all sides.

Seen in CarPlay route preview but probably also reproducible in route overview in both the phone and CarPlay.

/ref #2211 /cc @mapbox/navigation-ios