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

code/modules/power/apc.dm

@@ -1497,7 +1497,6 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/power/apc/auto_name, APC_PIXEL_OFFSET
 	for(var/obj/machinery/light/L in area)
 		L.on = TRUE
 		L.break_light_tube()
-		L.on = FALSE
 		stoplag()
 
 /obj/machinery/power/apc/proc/shock(mob/user, prb)

code/modules/power/lighting/light.dm

@@ -414,6 +414,7 @@
 			sleep(rand(5, 15))
 		on = (status == LIGHT_OK)
 		update(FALSE)
+		. = TRUE //did we actually flicker?
 	flickering = FALSE
 
 // ai attack - make lights flicker, because why not