Fix ladder NavMesh in rise roof backrooms

[sunzenshen]

Requires ladder climbing PR to work:
NeotokyoRebuild/neo#1633

[sunzenshen]

Why this PR

The Rise roof backrooms are never used because the ladder connection is not present:

Also, the bots tend to run into the fences/door because the navmesh intersects the obstacles:

(the middle line is actually a cutting guide, not a break in the NavArea)

Manual fixes implemented

ran nav_build_ladder:

Known Issues

The ladder going to the window cleaner drop route is completely disconnected:

(I didn't bother connecting these stairs, because previous experiments showed that bots cannot stay still on the ledge walks and will plummet to their doom. Without further behavioral modifications, the bots cannot safely drop down the side of the building.)

Also, while the bots drop down the ladder in a relatively smooth manner, the bots struggle to climb up this ladder, because they veer off to the side and fall back down:

Also generally, this route doesn't appear to be used much, because it's relatively out of the way of any points of interest.

[Rainyan]

Also, while the bots drop down the ladder in a relatively smooth manner, the bots struggle to climb up this ladder, because they veer off to the side and fall back down

I had better luck doing this kind of thing to stop them from getting stuck (and I guess they're more likely to veer against the right wall than fall off to the left):

However, maybe it's related to the bots trying to keep some space, or to the behavior where they start aiming behind themselves, but if I stayed too close to the ladder as the pack leader, they would have more trouble climbing than if I ran ahead and they had to catch up.

[sunzenshen]

I also have one theory that maybe we need to have the bots press forward some more after they clear the ladder height, though this same ladder style doesn't seem to have that much trouble going up in Threadplate (but ironically has some more trouble going down a few ladders in that map)