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

@@ -31,15 +31,15 @@ dataset_info:
         - en
   config_name: ig-en
   splits:
-  - name: test
-    num_bytes: 298670
-    num_examples: 552
   - name: train
     num_bytes: 2367989
     num_examples: 10000
   - name: validation
     num_bytes: 60154
     num_examples: 200
+  - name: test
+    num_bytes: 298670
+    num_examples: 552
   download_size: 2580255
   dataset_size: 2726813
 ---