[mod] dns_conf only need authentication for the api

data/actionsmap/yunohost.yml

@@ -297,7 +297,8 @@ domain:
             api: GET /domains/<domain>/dns
             configuration:
                 lock: false
-                authenticate: all
+                authenticate:
+                    - api
             arguments:
                 domain:
                     help: Target domain

src/yunohost/domain.py

@@ -220,7 +220,7 @@ def domain_remove(auth, domain, force=False):
     msignals.display(m18n.n('domain_deleted'), 'success')
 
 
-def domain_dns_conf(auth, domain):
+def domain_dns_conf(domain):
     """
     Generate DNS configuration for a domain