Fix config for sentence-transformers compatibility

config.json

@@ -1,6 +1,6 @@
 {
   "architectures": [
-    "PawanEmbdModel"
+    "XLMRobertaModel"
   ],
   "bos_token_id": 0,
   "dropout": 0.1,
@@ -9,7 +9,7 @@
   "hidden_size": 256,
   "intermediate_size": 1024,
   "max_position_embeddings": 512,
-  "model_type": "pawan_embd",
+  "model_type": "xlm-roberta",
   "num_heads": 4,
   "num_layers": 4,
   "output_size": 768,