fix linter errors

uwsgi-python/vars/pretix.yml

@@ -93,8 +93,7 @@ pretix_entropy_voucher_code: 16  # <255
 
 pretix_ldap: false  # do not forget to enable it via plugins
 pretix_ldap_bind_url: "ldaps://ad.example.com"
-pretix_ldap_bind_dn: "EXAMPLE\user"
+pretix_ldap_bind_dn: "EXAMPLE\\user"
 pretix_ldap_password: "secret"
 pretix_ldap_search_base: "cn=User,dc=example,dc=com"
 pretix_ldap_search_filter: "(&(objectClass=inetOrgPerson)(mail={email}))"
-