Fix neural check in lua_cfg_transform.lua

check for neural.enabled to see if it's enabled. only checking for neural is always true unless someone messed with config files.

lualib/lua_cfg_transform.lua

@@ -544,7 +544,7 @@ return function(cfg)
   end
 
   -- If neural network is enabled we MUST have `check_all_filters` flag
-  if cfg.neural then
+  if cfg.neural and cfg.neural.enabled then
     if not cfg.options then
       cfg.options = {}
     end