[FIX] LDAP Sync error

[fastrde]

Closes #17363

In loginHelper.js the function addLdapUser from sync.js was called with the wrong argument count. The reference to ldap was missing, so searchAllSync got called on undefined

Function signature in sync.js:

export function addLdapUser(ldapUser, username, password, ldap) {...}

Call in loginHelper.js:

const result = addLdapUser(ldapUser, username, loginRequest.ldapPass);

Fix:

const result = addLdapUser(ldapUser, username, loginRequest.ldapPass, ldap);

That's it.