Change "resize" folder to "%nid"

The "resize" directory is not intended to be used by any part of the site other than the Image Resize Filter. Considering the images are completely temporary, they may be deleted at any time and not recreated until the content that contains the image is viewed, so I'd recommend not trying to use it for any other purpose as these images may not exist at any given time.

This filter works by using the original file path and just sticking "resize/" to the front of it (plus the dimensions at the end), so if you'd like to put things into order within the resize directory, use a module that organizes your files appropriately in their original directories, such as FileField Paths or Upload Path.

Since this module is not intended to store files for any other module's use or restructure directories, I'm marking by design.