Port avoidance setting UI mismatch.

Issue description

Port avoidance setting often doesn't match UI.

Reproduction steps

1. Load attached save. Port avoidance.save
2. Press [T] Transports.
3. Press Molten channel.
4. Notice that port avoidance, F, is white, avoid blocking ports.
5. Start dragging a molten channel from Blast furnace output to Metal caster input.

Expected result:
A belt should avoid blocking other Blast furnace ports.

Actual result:
A belt is blocking, not avoiding other Blast furnace output ports (molten and U-shape).

Game version and build number

v0.5.4f (b241)

Operating system

Windows

Attachments

Video demo link: https://youtu.be/I7aDwbkTUgo

Files not imported: Port avoidance.save