Actor AI refuses to pathfind around enemy doors #396

Actor::UpdateMovePath suggests that while friendly doors are ignored, the pathfinding AI should at least try to find a route around closed doors. This doesn't happen for some reason.

To reproduce: Create a bunker with an enemy door closer to the bottom, and another opening above it. Set an (AHuman) actor to go inside the bunker, and it will attempt to take the fastest route through the door rather than going around it.