message: fix image_height & image_width param
diff: @@ -157,8 +157,8 @@ absl::Status ImagePreprocessor::Preprocess(const FrameBuffer& frame_buffer,
  const int expected_depth = Tensor()->dims->data[3];
  // HxW of the input image.
  - const int image_height = frame_buffer.dimension().height;
  - const int image_width = frame_buffer.dimension().width;
  + const int image_height = roi.height();
  + const int image_width = roi.width();
  const int height = height_mutable ? image_height : expected_height;
  const int width = width_mutable ? image_width : expected_width;
  