Update app.py

Removed DDGST as it isn't an actual tool

app.py

@@ -176,7 +176,7 @@ agent = CodeAgent(
     model=model,
     tools=[final_answer, image_generation_tool,webpage_contents_get,
           webpage_header_get, webpage_contents_soup_links, webpage_contents_soup_paragraphs,
-          summarize_and_answer_from_web, webpage_json_get, DuckDuckGoSearchTool], ## add your tools here (don't remove final answer)
+          summarize_and_answer_from_web, webpage_json_get], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,