Fix the dataset viewer issue

See https://huggingface.co/datasets/MightyStudent/Egyptian-ASR-MGB-3/discussions/4

I reproduced in this dataset: https://huggingface.co/datasets/severo/Egyptian-ASR-MGB-3

README.md

@@ -1,11 +1,4 @@
 ---
-dataset_info:
-  features:
-    - name: audio
-      dtype:
-        audio:
-          sampling_rate: 16000
-    - name: sentence
 language:
 - ar
 tags: