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

@@ -97,15 +97,15 @@ dataset_info:
           3: E_CLS
   config_name: lst20
   splits:
-  - name: test
-    num_bytes: 8217425
-    num_examples: 5250
   - name: train
     num_bytes: 107725145
     num_examples: 63310
   - name: validation
     num_bytes: 9646167
     num_examples: 5620
+  - name: test
+    num_bytes: 8217425
+    num_examples: 5250
   download_size: 0
   dataset_size: 125588737
 ---