allow images from ['properties']['image']['description'] in nft token

apps/block_scout_web/lib/block_scout_web/views/tokens/instance/overview_view.ex

@@ -21,9 +21,17 @@ defmodule BlockScoutWeb.Tokens.Instance.OverviewView do
 
   def image_src(instance) do
     cond do
-      instance.metadata && instance.metadata["image_url"] -> instance.metadata["image_url"]
-      instance.metadata && instance.metadata["image"] -> instance.metadata["image"]
-      true -> image_src(nil)
+      instance.metadata && instance.metadata["image_url"] ->
+        instance.metadata["image_url"]
+
+      instance.metadata && instance.metadata["image"] ->
+        instance.metadata["image"]
+
+      instance.metadata && instance.metadata["properties"]["image"]["description"] ->
+        instance.metadata["properties"]["image"]["description"]
+
+      true ->
+        image_src(nil)
     end
   end