Update app.py

app.py

@@ -472,7 +472,7 @@ def create_zip_of_files_mp3(mp3_files, wav_files, input_question):
             z.write(f)
     return short_zip_name
 
-def create_zip_of_files_md(md_files input_question):
+def create_zip_of_files_md(md_files, input_question):
     """
     Zip up all relevant files, limiting the final zip name to ~20 chars
     to avoid overly long base64 strings.