open public access to ketcher clean_up btn

app/api/api.rb

@@ -21,7 +21,8 @@ class API < Grape::API
     end
 
     def is_public_request?
-      request.path.include?('/api/v1/public/')
+      request.path.include?('/api/v1/public/') ||
+        request.path.include?('/api/v1/ketcher/layout')
     end
 
     def cache_key search_method, arg, molfile, collection_id, molecule_sort, opt