Update app.py

app.py

@@ -69,7 +69,7 @@ with open("prompts.yaml", 'r') as stream:
     prompt_templates = yaml.safe_load(stream)
 
     # registry.py
-from tools import calculator, get_current_time_in_timezone
+from tool import calculator, get_current_time_in_timezone
 from tools.final_answer import FinalAnswerTool
 from smolagents import load_tool