Removes needless proc

code/modules/power/apc.dm

@@ -1367,8 +1367,6 @@
 		cell.use(20)
 		spawn(0)
 			for(var/obj/machinery/light/L in area)
-				if(!L.isfunctional())
-					continue
 				if(prob(chance))
 					L.broken()
 					stoplag()

code/modules/power/lighting.dm

@@ -579,9 +579,6 @@
 		sleep(1)
 		qdel(src)
 
-/obj/machinery/light/proc/isfunctional()
-	return status == LIGHT_OK
-
 // the light item
 // can be tube or bulb subtypes
 // will fit into empty /obj/machinery/light of the corresponding type