fixes issue with ghosts being able to affect the world, oversight from the crossed refactor (#59010)

* as anything in _SendSignal

* Revert "as anything in _SendSignal"

This reverts commit 350c4b33d975d25003afb2cab2458a3026676559.

* ghosts can no longer affect the world (hopefully)

code/modules/mob/dead/observer/observer.dm

@@ -123,7 +123,7 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 		else
 			T = SSmapping.get_station_center()
 
-	forceMove(T)
+	abstract_move(T)
 
 	if(!name) //To prevent nameless ghosts
 		name = random_unique_name(gender)
@@ -334,10 +334,10 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	if(glide_size_override)
 		set_glide_size(glide_size_override)
 	if(NewLoc)
-		forceMove(NewLoc)
+		abstract_move(NewLoc)
 		update_parallax_contents()
 	else
-		forceMove(get_turf(src))  //Get out of closets and such as a ghost
+		abstract_move(get_turf(src))  //Get out of closets and such as a ghost
 		if((direct & NORTH) && y < world.maxy)
 			y++
 		else if((direct & SOUTH) && y > 1)
@@ -439,7 +439,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		to_chat(usr, "<span class='warning'>No area available.</span>")
 		return
 
-	usr.forceMove(pick(L))
+	usr.abstract_move(pick(L))
 	update_parallax_contents()
 
 /mob/dead/observer/verb/follow()
@@ -510,7 +510,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 			var/turf/T = get_turf(M) //Turf of the destination mob
 
 			if(T && isturf(T)) //Make sure the turf exists, then move the source to that destination.
-				A.forceMove(T)
+				A.abstract_move(T)
 				A.update_parallax_contents()
 			else
 				to_chat(A, "<span class='danger'>This mob is not located in the game world.</span>")
@@ -705,7 +705,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 			var/tz = text2num(href_list["z"])
 			var/turf/target = locate(tx, ty, tz)
 			if(istype(target))
-				forceMove(target)
+				abstract_move(target)
 				return
 		if(href_list["reenter"])
 			reenter_corpse()