Standardize on using `show_deleted: true` instead of `tags: "status:any"`
when rendering thumbnails and we want to show deleted thumbnails.
Also fixes it so that deleted thumbnails are shown when reordering pools
and favorite groups.
Previously if a pool had >100 posts then the 'Order' link wouldn't
appear in the navbar, but it was still possible to visit the pool order
page directly. If a user did so, only the first 100 posts in the pool
would be shown in the drag-and-drop widget. If they tried to reorder the
pool anyway, then everything beyond the first 100 posts would be
silently removed from the pool.
Now we always show the 'Order' link, but we disable the drag-and-drop
reordering widget when the pool has >100 posts to prevent posts from
being silently removed.
