style: simplify double string on the same line

Author: italojohnny

src/backend/base/langflow/components/agents/tool_calling.py

@@ -45,5 +45,5 @@ def create_agent_runnable(self):
         try:
             return create_tool_calling_agent(self.llm, self.tools or [], prompt)
         except NotImplementedError as e:
-            message = f"{self.display_name} does not support tool calling." "Please try using a compatible model."
+            message = f"{self.display_name} does not support tool calling. Please try using a compatible model."
             raise NotImplementedError(message) from e