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

@@ -202,12 +202,12 @@ dataset_info:
       - name: slot_id
         dtype: int64
   splits:
-  - name: test
-    num_bytes: 2650700
-    num_examples: 11
   - name: train
     num_bytes: 7402373
     num_examples: 26
+  - name: test
+    num_bytes: 2650700
+    num_examples: 11
   - name: validation
     num_bytes: 1993857
     num_examples: 8