fix crash in old lights conversion abm

lighting.lua

@@ -1,6 +1,9 @@
 
 -- This file supplies glowlights
 
+local dirs1 = { 20, 23, 22, 21 }
+local dirs2 = { 9, 18, 7, 12 }
+
 local S = homedecor.gettext
 
 local colors = {"yellow","white"}