Add a play icon to video previews to distuingish from images

⚠️ This issue respects the following points: ⚠️ • This is a bug, not a question or a configuration/webserver/proxy issue. • This issue is not already reported on Github _(I've searched it)_. • Nextcloud Server is up to date. See [Maintenance and Release Schedule]( for supported versions. • Nextcloud Server is running on 64bit capable CPU, PHP and OS. • I agree to follow Nextcloud's [Code of Conduct]( Bug description After enable video previews (NC24), It is not possible to distinguish between photo and video previews. The video preview should show a centered play icon (the android app does show it!). Am I missing something? Steps to reproduce 1. Enable video previews in config.php 2. Open folder with images and videos in the web 3. Preview are quite similiar and it is not easy to distinguish between a image and a video Expected behavior The video preview should display a center play icon. Installation method Manual installation Ope…