Fix dacledit.py object query on specified DN

[MaxToffy]

Summary

This simple patch changes the LDAP query to use _lookedup_principal as the search base instead of self.domain_dumper.root when using a Distinguished Name.

Before:
The query started at the domain root (self.domain_dumper.root = DC=DOMAIN,DC=TLD) and used a filter to locate the DN. This failed finding objects such as DNS zones like DC=RootDNSServers,CN=MicrosoftDNS,DC=DomainDnsZones,DC=DOMAIN,DC=TLD.

After:
The query directly targets _lookedup_principal as the base, ensuring the object is correctly located.