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

@@ -40,12 +40,12 @@ dataset_info:
           3: tch
           4: sbz
   splits:
-  - name: test
-    num_bytes: 799587
-    num_examples: 262
   - name: train
     num_bytes: 1762905
     num_examples: 638
+  - name: test
+    num_bytes: 799587
+    num_examples: 262
   download_size: 1042653
   dataset_size: 2562492
 ---