fixed typo in labels

test_data/test_labels.txt

 test_image1.jpg: [3, 1, 4, 5, 4, 3, 5, 4, 4]
-test_image2.jpg: [5, 4, 0, 5, 2, 3, 3, 0, 5]
+test_image2.jpg: [5, 3, 0, 5, 2, 3, 3, 0, 5]
 test_image3.jpg: [4, 2, 4, 4, 5, 2, 1, 5, 4]
 test_image4.jpg: [1, 0, 2, 4, 4, 3, 2, 5, 0]
 test_image5.jpg: [2, 1, 3, 0, 3, 4, 1, 1, 3]