Problem with favicon for non root path

Description

• If you run the sms on a domain with a prefix, e.g. www.domain.org/sms it tries to load the favicon from www.domain.org/favicon.ico instead of ``www.domain.org/sms/favicon.ico` and results in a 404
• the sms in the path is the BASE_URL environment variable
• it should be possible to load the favicon from the basepath