fixes elevation being permanent if you spawn on it (#85952)

## About The Pull Request

1 line change that makes spawning on stuff such as table not offset you
forever

## Why It's Good For The Game

fixes #84121

## Changelog
🆑
fix: spawning on a table or other elevated object does not offset you
forever
/🆑

code/datums/elements/elevation.dm

@@ -151,8 +151,8 @@
 
 /datum/element/elevation_core/proc/on_initialized_on(turf/source, atom/movable/spawned)
 	SIGNAL_HANDLER
-	if(isliving(spawned))
-		elevate_mob(spawned)
+	if(isliving(spawned) && !HAS_TRAIT(spawned, TRAIT_ON_ELEVATED_SURFACE))
+		on_entered(entered = spawned)
 
 /datum/element/elevation_core/proc/on_exited(turf/source, atom/movable/gone)
 	SIGNAL_HANDLER