Update app.py

app.py

@@ -448,6 +448,7 @@ def run_demo(
     if model_paths is None:
         model_paths = {
             "VibeVoice-Large":"aoi-ot/VibeVoice-Large", # "microsoft/VibeVoice-Large",
+            "VibeVoice-7B": "aoi-ot/VibeVoice-7B",
             "VibeVoice-1.5B": "microsoft/VibeVoice-1.5B"
         }