ai-guidelines: Update "selecting icon" screenshot from Figma

The icon wrapper now uses the rh icons as the preferred icon set so you do not need to go through the process of selecting the library and ui icon folder.

<img width="1242" height="611" alt="Image" src="https://github.com/user-attachments/assets/65bdd85a-1f37-4be9-b052-c3f39daf9a50" />