Updated eos_token to <|end|>

Wrong token causes issues with https://github.com/huggingface/text-generation-inference, as it cannot be easily overridden.

special_tokens_map.json

@@ -6,6 +6,6 @@
     "<|end|>"
   ],
   "bos_token": "<|endoftext|>",
-  "eos_token": "<|endoftext|>",
+  "eos_token": "<|end|>",
   "unk_token": "<|endoftext|>"
 }