Post Light sprite fix and state (#8578)

* adjusted post light sprite and added empty state

* update construction location

Resources/Textures/Structures/Lighting/LightPosts/small_light_post.rsi/meta.json

@@ -12,6 +12,9 @@
     },
     {
       "name": "on"
+    },
+    {
+      "name": "empty"
     }
   ]
 }