Revert "12/21 modernizations from TG live"

code/game/objects/effects/step_triggers.dm

@@ -3,7 +3,7 @@
 /obj/effect/step_trigger
 	var/affect_ghosts = 0
 	var/stopper = 1 // stops throwers
-	var/mobs_only = FALSE
+	var/mobs_only = 0
 	invisibility = INVISIBILITY_ABSTRACT // nope cant see this shit
 	anchored = 1
 
@@ -14,7 +14,7 @@
 	..()
 	if(!H)
 		return
-	if(isobserver(H) && !affect_ghosts)
+	if(istype(H, /mob/dead/observer) && !affect_ghosts)
 		return
 	if(!istype(H, /mob) && mobs_only)
 		return
@@ -25,7 +25,6 @@
 /obj/effect/step_trigger/message
 	var/message	//the message to give to the mob
 	var/once = 1
-	mobs_only = TRUE
 
 /obj/effect/step_trigger/message/Trigger(mob/M)
 	if(M.client)