Fix call to fields_name in endpoint scaffold template

[ci skip]

Author: tmaier

lib/pliny/templates/endpoint_scaffold.erb

@@ -7,7 +7,7 @@ module Endpoints
 
       get do
         <%= fields_name %> = uuid_paginator(<%= singular_class_name %>, args: { max: 10 })
-        encode serialize(%= fields_name %)
+        encode serialize(<%= fields_name %>)
       end
 
       post do