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

@@ -109,12 +109,12 @@ dataset_info:
           0: 'false'
           1: 'true'
   splits:
-  - name: test
-    num_bytes: 28241991
-    num_examples: 63978
   - name: train
     num_bytes: 71282358
     num_examples: 159571
+  - name: test
+    num_bytes: 28241991
+    num_examples: 63978
   download_size: 0
   dataset_size: 99524349
 ---