Put invisible queue into its own folder

This is a requirement for all objects that will get LGX compilation

Author: Gymnasiast

objects/official/footpath_surface/queue_invisible_preview.png objects/official/footpath_surface/openrct2.footpath_surface.queue_invisible/images/preview.png

@@ -13,7 +13,7 @@
     },
     "images": [
         {
-            "path": "queue_invisible_preview.png",
+            "path": "images/preview.png",
             "x": 1,
             "y": 1
         },