Revert bind as user config option.

Author: stevebauman

src/Config/auth.php

@@ -122,21 +122,6 @@
 
     'bind_user_to_model' => env('ADLDAP_BIND_USER_TO_MODEL', false),
 
-    /*
-    |--------------------------------------------------------------------------
-    | Bind As User
-    |--------------------------------------------------------------------------
-    |
-    | The bind as user option will bind to your AD server as the
-    | authenticated user. This is useful if you want LDAP
-    | operations ran underneath the bound user.
-    |
-    | This option must be true or false.
-    |
-    */
-
-    'bind_as_user' => env('ADLDAP_BIND_AS_USER', false),
-
     /*
     |--------------------------------------------------------------------------
     | Sync Attributes