Update tokenizer_config.json

tokenizer_config.json

@@ -319,6 +319,7 @@
   "eos_token": "<|endoftext|>",
   "model_max_length": 2048,
   "pad_token": "<|endoftext|>",
+  "padding_side": "right",
   "tokenizer_class": "CodeGenTokenizer",
   "unk_token": "<|endoftext|>"
 }