revert to 3B style tokenizer

tokenizer_config.json

@@ -8,9 +8,5 @@
       "tokenization_rwkv_world.RWKVWorldTokenizer",
       null
       ]
-  },
-
-  "clean_up_tokenization_spaces": true,
-  "errors": "replace",
-  "model_max_length": 1000000000000000019884624838656
+  }
 }