Fixes ghosts' boo ability going on cooldown when the light they tried to flicker didn't flick (#62965)

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

@@ -567,12 +567,10 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	if(bootime > world.time)
 		return
 	var/obj/machinery/light/L = locate(/obj/machinery/light) in view(1, src)
-	if(L)
-		L.flicker()
+	if(L?.flicker())
 		bootime = world.time + 600
-		return
 	//Maybe in the future we can add more <i>spooky</i> code here!
-	return
+
 
 /mob/dead/observer/verb/toggle_ghostsee()
 	set name = "Toggle Ghost Vision"