[stashdb performer gallery] [Feature] Don't download double images

[Peronia]

I tried the plugin at the perfromer Adrianna Nicole and got 40 images. 2 of them are dupes. Here are the double pulled image:

https://cdn.theporndb.net/performer/a9/19/db/228ca465e0814194d61a8bce817d49c/poster/adrianna-nicole.webp https://cdn.theporndb.net/performer/94/7c/42/b90c16a3d5e7f3ae8547ffc66ef5ab6/poster/adrianna-nicole.webp

Maybe we can add something to prevent this?