Removes two redundant components (#76866)

## About The Pull Request

We're starting to get to have enough components that people don't
realise that what they want already exists but doesn't have the name
they expect 🙃

I recently added `track_hierarchical_movement` which is similar enough
to `connect_containers` that it shouldn't independently exist, even if I
like sending a new signal more than the ugly setup pattern for
`connect_loc`.

`trait_loc` is actually older than `give_turf_traits` but
`give_turf_traits` covers more edge cases than `turf_loc` so seems like
the better one to maintain.
HOWEVER `give_turf_traits` held a list of references to atoms in it,
which isn't great in an element. I couldn't think of a way to completely
eliminate the list, but it isn't a list of references any more so it
shouldn't cause any hard deletions.

## Why It's Good For The Game

Having two components which do the same thing but marginally differently
is confusing and going to cause us trouble down the line.

## Changelog

Not player facing

code/game/objects/structures/holosign.dm

@@ -123,7 +123,8 @@
 /obj/structure/holosign/barrier/atmos/Initialize(mapload)
 	. = ..()
 	air_update_turf(TRUE, TRUE)
-	AddElement(/datum/element/trait_loc, TRAIT_FIREDOOR_STOP)
+	var/static/list/turf_traits = list(TRAIT_FIREDOOR_STOP)
+	AddElement(/datum/element/give_turf_traits, turf_traits)
 
 /obj/structure/holosign/barrier/atmos/block_superconductivity() //Didn't used to do this, but it's "normal", and will help ease heat flow transitions with the players.
 	return TRUE