Removed DuckDuckGoSearchTool from tools list

DuckDuckGoSearchTool has not been implemented. Re-added get_time_difference to tools list.

app.py

@@ -151,7 +151,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[final_answer, DuckDuckGoSearchTool, image_generation_tool], ## add your tools here (don't remove final answer)
+    tools=[final_answer, image_generation_tool, get_time_difference], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,