Entities inside a wall can't see anything

The test for "one step in each cardinal direction is always visible" was
giving a false-negative for an entity at the same position as a wall -
not only is this something that would ostensibly never happen, it's also
completely reasonable to assume that someone stuck in a wall (due to a
bad teleport perhaps?) wouldn't be able to see anything, on account of
their head being INSIDE A WALL.

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