Add an icon for the account type "Uni-ID"

See: https://portal.fachschaft.cl.uni-heidelberg.de/uni-services

• "CL-Account" has an icon (a small person silhouette)
• "Uni-ID" does not have an icon

You can edit this by editing portal/static/js/components/pieces/AccountRequired.mjs by adding another line to the icons object (aka. dictionary in Python).

Find icons under https://fontawesome.com/icons (you need to filter for "Free" icons, we don't have Font Awesome pro)