When using a delegated LDAP directory, users are able to change their display name and email address in the 'manage account' section.
There's no point to allowing this, and it just confuses people - the settings will be resynced when the user logs in again (
This only happens with delegated LDAP directories, not 'regular' ones.
This is similar to
STASH-2978 which fixed this issue for the password setting, but not the display name/email.