Steps to reproduce

1. Install Ibexa DXP v3
2. In ezplatform.yaml file under section siteaccess:  list. Add admin siteaccess

ezplatform:
    siteaccess:
        list:
            - site
            - admin 

1. Create a new role
2. Add policy User/login with siteaccess limitation on admin siteaccess

Result

The name of siteaccess in the limitation column is duplicate 

Expected

The name of siteaccess in the limitation column should be displayed once