Add ldap(s):// prefix to host

This may or may not be a real issue, since I have only one directory to test against. I'm only able to connect to my LDAP server if I have the ldap(s):// prefix on the host name. If this is actually the normal case for active directory, it would be helpful to have a dropdown next to the host field that lets you select one of those two so that it always ends up in the config file. (Excuse the terrible drawing :) )