[MIRROR] Fixes ghosts' boo ability going on cooldown when the light they tried to flicker didn't flick [MDB IGNORE] (#9672)

* Fixes ghosts' boo ability going on cooldown when the light they tried to flicker didn't flick

* Update code/modules/power/lighting/light.dm

Co-authored-by: ShizCalev <ShizCalev@users.noreply.github.com>
Co-authored-by: GoldenAlpharex <58045821+GoldenAlpharex@users.noreply.github.com>

code/game/objects/items/food/burgers.dm

@@ -174,8 +174,7 @@
 			step(src, dir)
 		if(65 to 70)
 			var/obj/machinery/light/L = locate(/obj/machinery/light) in view(4, src)
-			if(L)
-				L.flicker()
+			L?.flicker()
 		if(62 to 64)
 			playsound(loc,pick('sound/hallucinations/i_see_you1.ogg', 'sound/hallucinations/i_see_you2.ogg'), 50, TRUE, ignore_walls = FALSE)
 		if(61)