fix typo

app.py

@@ -47,8 +47,8 @@ def get_model():
 
     detection_model = AutoDetectionModel.from_pretrained(
         model_type='mmdet',
-        model_path=model_path,
-        config_path=config_path,
+        model_path=MMDET_YOLOX_TINY_MODEL_PATH,
+        config_path=MMDET_YOLOX_TINY_CONFIG_PATH,
         confidence_threshold=0.5,
         device="cpu",
     )