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

@@ -76,12 +76,12 @@ dataset_info:
           2: pos
   config_name: dutch_social
   splits:
-  - name: test
-    num_bytes: 35185351
-    num_examples: 54268
   - name: train
     num_bytes: 105569586
     num_examples: 162805
+  - name: test
+    num_bytes: 35185351
+    num_examples: 54268
   - name: validation
     num_bytes: 34334756
     num_examples: 54269