move invisibility to defines (#17612)

* move Invisibility to defines

* .

* .

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

@@ -93,17 +93,18 @@
 	var/last_revive_notification = null // world.time of last notification, used to avoid spamming players from defibs or cloners.
 	var/cleanup_timer // Refernece to a timer that will delete this mob if no client returns
 
-/mob/observer/dead/Initialize(mapload, aghost = FALSE)
-
-	appearance = loc
 	invisibility = INVISIBILITY_OBSERVER
 	layer = BELOW_MOB_LAYER
 	plane = PLANE_GHOSTS
 	alpha = 127
+	sight = SEE_TURFS | SEE_MOBS | SEE_OBJS | SEE_SELF
+	see_invisible = SEE_INVISIBLE_OBSERVER
+
+/mob/observer/dead/Initialize(mapload, aghost = FALSE)
+
+	appearance = loc
 	admin_ghosted = aghost
 
-	sight |= SEE_TURFS | SEE_MOBS | SEE_OBJS | SEE_SELF
-	see_invisible = SEE_INVISIBLE_OBSERVER
 	see_in_dark = world.view //I mean. I don't even know if byond has occlusion culling... but...
 
 	var/turf/T
@@ -900,7 +901,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 		to_chat(src, span_info("You are now visible!"))
 
 	plane = (plane == PLANE_GHOSTS) ? PLANE_WORLD : PLANE_GHOSTS
-	invisibility = (plane == PLANE_WORLD) ? 0 : INVISIBILITY_OBSERVER
+	invisibility = (plane == PLANE_WORLD) ? INVISIBILITY_NONE : INVISIBILITY_OBSERVER
 
 	// Give the ghost a cult icon which should be visible only to itself
 	toggle_icon("cult")