Reorder split names

Reorder split names in the YAML metadata to be aligned with the order in the loading script.
See: https://github.com/huggingface/datasets/issues/5258

README.md

@@ -45,12 +45,12 @@ dataset_info:
       sequence: string
   config_name: dialog_re
   splits:
-  - name: test
-    num_bytes: 472306
-    num_examples: 357
   - name: train
     num_bytes: 1520940
     num_examples: 1073
+  - name: test
+    num_bytes: 472306
+    num_examples: 357
   - name: validation
     num_bytes: 490580
     num_examples: 358