[OPEN PR] Silicons can no longer see level 2 invisibility by default

[aft2001]

I dislike this change if it applies to AI cameras, unless it requires the AI to somehow invest resources, time, effort, etc. into seeing people that are cloaked (but not overly so - toggling something on which takes a few seconds to enable or disable and makes your eye move more slowly and it immediately disables if you jump by clicking a distant tile or tracking someone far away). Though I agree with lowering the visibility for regular borgs, that makes sense, and requires the AI and borgs to coordinate to handle someone that's cloaked.