Map culling doesn't respect pan

[Esnardo]

Issue: Map culling doesn't work properly if you pan the camera. Things that are on screen get culled out if the game thinks they aren't on screen.

Repro:

1. Go to map
2. Zoom in
3. Pan to something that should have icons, like the travelling hunters, or starports
4. On second thought, this could actually be a symptom of #557

V2.0.0

LGK20, Android

[Graviton48]

Same on Windows desktop, v2.0.1