Remove request to set default chat model during interactive init

It wasn't being set correctly and seems unnecessary as can switch
to desired chat models via the settings page or chat side pane easily

Author: debanjum

src/khoj/utils/initialization.py

@@ -159,23 +159,7 @@ def _create_chat_configuration():
             interactive=interactive,
         )
 
-        # Explicitly set default chat model
-        chat_models_configured = ChatModel.objects.count()
-        if chat_models_configured > 0:
-            default_chat_model_name = ChatModel.objects.first().name
-            # If there are multiple chat models, ask the user to choose the default chat model
-            if chat_models_configured > 1 and interactive:
-                user_chat_model_name = input(
-                    f"Enter the default chat model to use (default: {default_chat_model_name}): "
-                )
-            else:
-                user_chat_model_name = None
-
-            # If the user's choice is valid, set it as the default chat model
-            if user_chat_model_name and ChatModel.objects.filter(name=user_chat_model_name).exists():
-                default_chat_model_name = user_chat_model_name
-
-            logger.info("🗣️ Chat model configuration complete")
+        logger.info("🗣️ Chat model configuration complete")
 
         # Set up offline speech to text model
         use_offline_speech2text_model = "n" if not interactive else input("Use offline speech to text model? (y/n): ")