fix(podcasts): modify style of image inside podcast list
fix(podcasts): modify style of image inside podcast list

In order to improve the visual experience if the cover is not square, the css applied to the image add `object-fit: cover` to allow usage of banner

davinkevin/Podcast-Server,davinkevin/Podcast-Server,davinkevin/Podcast-Server,davinkevin/Podcast-Server,davinkevin/Podcast-Server