修复手写数字识别的bug，缩放图片缩放错误

src/rasp_camera/scripts/mnist_recognition.py

@@ -86,7 +86,7 @@ class Mnist_Recognition:
         cv2.imshow('window_cropped', cropped)
         cv2.waitKey(3)
 
-        resized_img = cv2.resize(img,(28,28),interpolation = cv2.INTER_AREA)
+        resized_img = cv2.resize(cropped,(28,28),interpolation = cv2.INTER_AREA)
         cv2.imshow('window_resizedimg',resized_img)
         cv2.waitKey(3)