refactor(app.py): join path components correctly

app.py

@@ -10,7 +10,7 @@ def load_and_synthesize(text: str, path: str, sdp: float = 0.0, speed: float = 1
     model = TTSModel.from_path(bert, tokenizer)
     uid = "default"
     path = path.split("/")
-    filename = path[2:]
+    filename = "/".join(path[2:])
     repo_id = "/".join(path[:2])
     model.load_sbv2file_from_path(uid, hf_hub_download(repo_id, filename))
     print("All setup is done!")