Fix response_class in gpu_checker

routers/tool_gpu_checker.py

@@ -200,8 +200,8 @@ If that doesn't help, you can use Blender 2.79: https://www.blender.org/download
     return message
 
 
-@router.get("/gpu_checker")
-def gpu_checker(gpu_info: str = "", response_class=PlainTextResponse):
+@router.get("/gpu_checker", response_class=PlainTextResponse)
+def gpu_checker(gpu_info: str = ""):
     message = gpu_checker_get_message(gpu_info)
 
     return message