(auth/ldap) disable error reporting on connect, to prevent api to signal authentication errors as issues.

exception 'Exception' with message 'Error at /usr/local/opnsense/mvc/app/library/OPNsense/Auth/LDAP.php:236 - ldap_bind(): Unable to bind to server: Invalid credentials (errno=2)' in /usr/local/opnsense/mvc/app/controllers/OPNsense/Base/ApiControllerBase.php:84
Stack trace:
 0 [internal function]: OPNsense\Base\ApiControllerBase->APIErrorHandler(2,