Don't use retrieval mode by default

Author: tmichaeldb

mindsdb_sdk/agents.py

@@ -360,7 +360,6 @@ def _create_model_if_not_exists(self, name: str, model: Union[Model, dict]) -> M
         # Create a default model if it doesn't exist.
         default_model_params = {
             'predict': 'answer',
-            'mode': 'retrieval',
             'engine': 'langchain',
             'prompt_template': 'Answer the user"s question in a helpful way: {{question}}',
             # Use GPT-4 by default.