Increase the limit of 20 images in showcase of model to 50 images

Currently the carousel of a model has a limit of 20 image. For models trained with over 20 subjects and styles it is impossible to cover them just with 20 images.
Also with time if creator wants to add additional images, he must delete previous one - which deletes all likes and message people have left for an image. With 50 images it would allow a room for examples expansion without deleting images.