bug in img-preprocess quilting

[zyg2333]

canary_lib/canary_defense_method/img_preprocess/quilting/quilting.py
line 41: patch_index = i * NX + j
should be: patch_index = i * NY + j

[summorsmi]

canary_lib/canary_defense_method/img_preprocess/quilting/quilting.py line 41: patch_index = i * NX + j should be: patch_index = i * NY + j

Thanks for the suggestion, we have corrected it