修复包导入错误

read_params应该从ocr_det而不是ocr_system中导入

deploy/hubserving/ocr_det/module.py

@@ -18,7 +18,7 @@ import paddlehub as hub
 from tools.infer.utility import base64_to_cv2
 from tools.infer.predict_det import TextDetector
 from tools.infer.utility import parse_args
-from deploy.hubserving.ocr_system.params import read_params
+from deploy.hubserving.ocr_det.params import read_params
 
 
 @moduleinfo(