fixed file bug

app.py

@@ -185,6 +185,7 @@ def mp4_to_wav_or_mp3(mp4fileuploader, file_format):
                 videoinput.close()
             what_to_return = "convertedaudio.wav" if file_format == "wav" else "convertedaudio.mp3"
             os.remove(mp4fileuploader)
+            os.remove(what_to_return)
             return "Converted mp4 file successfully!", what_to_return
         except:
             raise gr.Error(traceback.format_exc())