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

@@ -103,15 +103,15 @@ dataset_info:
           1: pos
   config_name: prachathai67k
   splits:
-  - name: test
-    num_bytes: 110034036
-    num_examples: 6789
   - name: train
     num_bytes: 865848436
     num_examples: 54379
   - name: validation
     num_bytes: 108641386
     num_examples: 6721
+  - name: test
+    num_bytes: 110034036
+    num_examples: 6789
   download_size: 254240975
   dataset_size: 1084523858
 ---