[Wikipedia Loves Delpher Portrait gallery] Increase spacing between chevron and righthand side of select-box

https://kbnlwikimedia.github.io/GLAMorousToHTML/extras/delpher_humans_q5_gallery.html

<img width="1048" height="398" alt="Image" src="https://github.com/user-attachments/assets/bf9562ef-30ee-43df-bbb3-b29fab00cac4" />