Fix pixel order

Author: adamtheturtle

tests/mock_vws/fixtures/images.py

@@ -40,7 +40,7 @@ def _image_file(
             green = random.randint(0, 255)
             blue = random.randint(0, 255)
             if color_space != 'L':
-                pixels[i, j] = (red, green, blue)
+                pixels[j, i] = (red, green, blue)
     image.save(image_buffer, file_format)
     image_buffer.seek(0)
     return image_buffer