ldap_child: Removing duplicate log message
    
    Duplicate log messages were getting logged if trust relationship
    breaks for some reason from AD. That causes lot spam in syslog.
    This PR removes duplicate log entry and keeps extended log entry.
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3450
    
    Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>