Use keyword arguments for ApplicationService calls

Not all services are using keywords, which breaks those calls in Ruby 3

app/models/user.rb

@@ -92,7 +92,7 @@ class User < ApplicationRecord
   def devise_after_confirmation
     if ldap_entry[:mail] != self.email
       # E-Mail update confirmed
-      LdapManager::UpdateEmail.call(self.dn, self.email)
+      LdapManager::UpdateEmail.call(dn: self.dn, address: self.email)
     else
       # E-Mail from signup confirmed (i.e. account activation)
 
@@ -164,7 +164,7 @@ class User < ApplicationRecord
   end
 
   def avatar
-    @avatar_base64 ||= LdapManager::FetchAvatar.call(cn: cn, ou: ou)
+    @avatar_base64 ||= LdapManager::FetchAvatar.call(cn: cn)
   end
 
   def services_enabled