update config.json pad token id in respect to tokenizer_config pad token

tokenizer_config.json is using pad_token </s> , here in config.json pad_token_id is missing which is breaking running the model via TEI as it expecting a value in pad_token_id

config.json

@@ -36,7 +36,7 @@
   "norm_eps": 1e-05,
   "num_attention_heads": 12,
   "num_hidden_layers": 22,
-  "pad_token_id": null,
+  "pad_token_id": 2,
   "position_embedding_type": "absolute",
   "reference_compile": false,
   "sep_token_id": null,