Debian: Add paths for open-sans and font-awesome
    
    Debian has different paths and path suffix for font-awesome. Let's have
    explicit paths for all our fonts.
    
    Co-authored-by: Timo Aaltonen <tjaalton@debian.org>
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>