fix: replace rec_image_shape when manually set (#14371)

Author: JesuisTong

paddleocr.py

@@ -664,6 +664,8 @@ def __init__(self, **kwargs):
             params.rec_image_shape = "3, 48, 320"
         else:
             params.rec_image_shape = "3, 32, 320"
+        if kwargs.get("rec_image_shape") is not None:
+            params.rec_image_shape = kwargs.get("rec_image_shape")
         # download model if using paddle infer
         if not params.use_onnx:
             maybe_download(params.det_model_dir, det_url)