Update usage for custom Predictor (#16771)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

ultralytics/engine/model.py

@@ -543,9 +543,7 @@ class Model(nn.Module):
         prompts = args.pop("prompts", None)  # for SAM-type models
 
         if not self.predictor:
-            self.predictor = predictor or self._smart_load("predictor")(overrides=args, _callbacks=self.callbacks)
-            if predictor:
-                self.predictor.args = get_cfg(self.predictor.args, args)
+            self.predictor = (predictor or self._smart_load("predictor"))(overrides=args, _callbacks=self.callbacks)
             self.predictor.setup_model(model=self.model, verbose=is_cli)
         else:  # only update args if predictor is already setup
             self.predictor.args = get_cfg(self.predictor.args, args)