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

@@ -33,12 +33,12 @@ dataset_info:
           3: angry
   config_name: emo2019
   splits:
-  - name: test
-    num_bytes: 421555
-    num_examples: 5509
   - name: train
     num_bytes: 2433205
     num_examples: 30160
+  - name: test
+    num_bytes: 421555
+    num_examples: 5509
   download_size: 3362556
   dataset_size: 2854760
 ---