Show federation and email results also with exact user match unless containing @

Before when you have a user "smith" and a federated user "smith@example.com"
you could see the federation result with "smit" but not with "smith" anymore.
With most LDAP configurations and local backend setups this is disturbing and
causes issues.
The idea of not showing the email and federation on a matching user was with:
Local user registered with "smith@example.com" user id and having that same
email / cloud id in your contacts addressbook. So we now only hide those
"side results" when the search does contain an @

Signed-off-by: Joas Schilling <coding@schilljs.com>