patch num 2 for alphabetical configs/splits (#14)

- patch num 2 for alphabetical configs/splits (ca5059ad2d7f0834102f4a52f6510c8e9c984712)


Co-authored-by: Sanchit Gandhi <sanchit-gandhi@users.noreply.huggingface.co>

app.py

@@ -194,7 +194,7 @@ if len(dataset_df) > 0:
     selectable_configs.sort(key=lambda name: name.lower())
 
     if "-unspecified-" in selectable_configs:
-        selectable_configs.discard("-unspecified-")
+        selectable_configs.remove("-unspecified-")
         selectable_configs = ["-unspecified-"] + selectable_configs
 
     if dataset != "-any-":
@@ -210,7 +210,7 @@ if len(dataset_df) > 0:
         selectable_splits.sort(key=lambda name: name.lower())
 
         if "-unspecified-" in selectable_splits:
-            selectable_splits.discard("-unspecified-")
+            selectable_splits.remove("-unspecified-")
             selectable_splits = ["-unspecified-"] + selectable_splits
 
         split = st.sidebar.selectbox(