Update LoadingScript

I missed the order of the returns value(metadata_urls , data_urls)

GraySpectrogram.py

@@ -94,7 +94,7 @@ class GraySpectrogramConfig(datasets.BuilderConfig):
 class GraySpectrogram(datasets.GeneratorBasedBuilder):
 
     # データのサブセットはここで用意
-    data_urls, metadata_urls = get_information()
+    metadata_urls, data_urls = get_information()
     BUILDER_CONFIGS = [
         GraySpectrogramConfig(
             name="data 0-200",