Remove redundant splits section from dataset_infos.json

dataset_infos.json

@@ -61,16 +61,5 @@
         "num_examples": 63
       }
     }
-  },
-  "splits": {
-    "train": {
-      "num_examples": 498
-    },
-    "validation": {
-      "num_examples": 62
-    },
-    "test": {
-      "num_examples": 63
-    }
   }
 }