Fix eos_token in tokenizer_config.json

Not sure why it was set to `[EOS]`, the actual end token that appears in Kimi's output is `<|im_end|>`.

tokenizer_config.json

@@ -171,7 +171,7 @@
   },
   "bos_token": "[BOS]",
   "clean_up_tokenization_spaces": false,
-  "eos_token": "[EOS]",
+  "eos_token": "<|im_end|>",
   "extra_special_tokens": {},
   "model_max_length": 1000000000000000019884624838656,
   "pad_token": "[PAD]",