Let users only select MT3 model

app.py

@@ -94,7 +94,7 @@ with demo:
             The mt3 model transcribes multiple simultaneous instruments, but without velocities.
             """
             model = gr.Radio(
-                ["mt3", "ismir2021"], 
+                ["mt3"], 
                 label=model_label, 
                 value="mt3"
             )