Extract the conditional we're using to decide whether or not to render a
given entity at a position, and use that when getting the list of
entities to describe as a result of the "Look" command.
Change-Id: I1ec86211c2fcbd984dd52338fb5631667c22c723
Reviewed-on: https://cl.tvl.fyi/c/depot/+/903
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: BuildkiteCI
Tested-by: BuildkiteCI