Update tokenizer_config.json

tokenizer_config.json

@@ -7,6 +7,5 @@
   "mask_token": "[MASK]",
   "do_lower_case": true,
   "model_max_length": 512,
-  "vocab_file": "vocab.txt",
-  "sentencepiece_model_file": "sentencepiece.bpe.model"
+  "vocab_file": "sentencepiece.bpe.model"
 }