`items` are cleared if another input changes (e.g. `thumbs`)

[pappkamerad]

when another gallery input, like thumbs is changed after items is already set, this line here clears all items, resulting in nothing to be shown. https://github.com/daelmaak/ngx-gallery/blob/master/libs/gallery/src/lib/components/gallery/gallery.component.ts#L197

[daelmaak]

Thanks, will have a look 🙈