Very first LDAP config has empty ID

[MorrisJobke]

The first created LDAP config has the ID `` (empty string). That makes it hard to use the OCS API in #3162 to manipulate this, because then the response is:

$ curl -X GET http://admin:admin@localhost/server/ocs/v2.php/apps/user_ldap/api/v1/config/ -H  "OCS-APIRequest: true" -i
<?xml version="1.0"?>
<ocs>
 <meta>
  <status>failure</status>
  <statuscode>404</statuscode>
  <message>Invalid query, please check the syntax. API specifications are here: http://www.freedesktop.org/wiki/Specifications/open-collaboration-services. DEBUG OUTPUT:
</message>
 </meta>
 <data/>
</ocs>

@blizzz Any idea how to prevent this and fix it?

[blizzz]

Used to be intentional, but changed with 689df9a in #3162, coming to 12 and 11.0.2.

Workaround until: create 2 and delete the one without prefix subsequently.