Bulk-uploading modifier images to multiple modifiers

Operators can now mass-upload the same image to multiple modifiers by using the "Copy Settings to..." feature/button in the Bite Admin Portal.

1. Click on any source modifier and upload the desired image in that modifier. Click "Update".
2. Click on "Copy Settings to..." button
3. Select all desired modifiers to copy over images to and click "Next"
4. Select "Images" checkbox and click "Copy Settings"