fix: Show the select item of layout 4

Before: <img width="273" alt="image" src="https://github.com/jbilcke-hf/ai-comic-factory/assets/5910926/c5cb9dd6-9957-43ba-a0ff-1d562c36a7b9"> after: <img width="1721" alt="image" src="https://github.com/jbilcke-hf/ai-comic-factory/assets/5910926/cbd3d34f-0f00-4790-b40a-b51c219295a1"> Hi, I am terry, an enthusiastic comic fan and I'm interested in contributing to the open-source development of the jbilcke-hf/ai-comic-factory project. I've noticed there's a minor UI issue with the layout selection, and I'd like to attempt to submit a PR to fix it.