fix: revert zephyr tokenizer config change

tokenizer_config.json

@@ -5,13 +5,5 @@
       "tokenization_arcade100k.Arcade100kTokenizer",
       null
     ]
-  },
-  "added_tokens_decoder": {},
-  "bos_token": "<|endoftext|>",
-  "chat_template": "{% for message in messages %}\n{% if message['role'] == 'user' %}\n{{ '<|user|>\n' + message['content'] + eos_token }}\n{% elif message['role'] == 'system' %}\n{{ '<|system|>\n' + message['content'] + eos_token }}\n{% elif message['role'] == 'assistant' %}\n{{ '<|assistant|>\n'  + message['content'] + eos_token }}\n{% endif %}\n{% if loop.last and add_generation_prompt %}\n{{ '<|assistant|>' }}\n{% endif %}\n{% endfor %}",
-  "clean_up_tokenization_spaces": true,
-  "eos_token": "<|endoftext|>",
-  "errors": "replace",
-  "model_max_length": 4096,
-  "pad_token": "<|endoftext|>"
+  }
 }