fix: Fix using correct object for fetching loop

Author: anubhav756

packages/toolbox-langchain/src/toolbox_langchain/tools.py

@@ -53,12 +53,12 @@ async def _arun(self, **kwargs: Any) -> dict[str, Any]:
         coro = self.__core_sync_tool._ToolboxSyncTool__async_tool(**kwargs)
 
         # If a loop has not been provided, attempt to run in current thread.
-        if not self.__core_sync_client._ToolboxSyncClient__loop:
+        if not self.__core_sync_tool._ToolboxSyncTool__loop:
             return await coro
 
         # Otherwise, run in the background thread.
         await asyncio.wrap_future(
-            asyncio.run_coroutine_threadsafe(coro, self.__core_sync_client._ToolboxSyncTool__loop)
+            asyncio.run_coroutine_threadsafe(coro, self.__core_sync_tool._ToolboxSyncTool__loop)
         )