Wall mounted vendors are no longer a Brand Intelligence liability (#71468)
Wall mounted vendors are no longer a Brand Intelligence liability (#71468)

## About The Pull Request

Wall mounted vendors (currently just the wallmed) are no longer able to
be selected or spread to during the Brand Intelligence event. This is
done by checking the density variable, rather than just excluding the
wallmed, in case any other wall mounted vendors are implemented.

Also, adds and removes empty lines that were bugging me.
## Why It's Good For The Game

Closes #71465.

Wall mounted vendors look wonky when they leave the wall due to their
visual offset, and since they don't look like vending machines it can be
a bit confusing. Less buggy vendors and more immersive slapstick comedy.

## Changelog
:cl:
fix: Wall mounted vendors can no longer receive brand intelligence.
/:cl:
tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation,tgstation/tgstation