get rid of mob.see_in_dark and species.darksight

They don't work with the current lighting system and cause weird artifacts.

Signed-off-by: Mloc <colmohici@gmail.com>

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

@@ -34,7 +34,6 @@ var/global/list/image/ghost_sightless_images = list() //this is a list of images
 /mob/dead/observer/New(mob/body)
 	sight |= SEE_TURFS | SEE_MOBS | SEE_OBJS | SEE_SELF
 	see_invisible = SEE_INVISIBLE_OBSERVER
-	see_in_dark = 100
 	verbs += /mob/dead/observer/proc/dead_tele
 
 	stat = DEAD
@@ -646,10 +645,12 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 /mob/dead/observer/proc/updateghostsight()
 	if (!seedarkness)
 		see_invisible = SEE_INVISIBLE_OBSERVER_NOLIGHTING
+		see_in_dark = 100
 	else
 		see_invisible = SEE_INVISIBLE_OBSERVER
 		if (!ghostvision)
 			see_invisible = SEE_INVISIBLE_LIVING;
+		see_in_dark = 0
 	updateghostimages()
 
 /proc/updateallghostimages()