pretix: cleanup config

roles/pretix/templates/pretix.cfg.j2

@@ -7,23 +7,15 @@ trust_x_forwarded_for=on
 trust_x_forwarded_proto=on
 
 [database]
-; For MySQL, replace with "mysql"
 backend=postgresql
 name={{ pretix_dbname }}
 user={{ pretix_dbuser }}
-; For MySQL, enter the user password. For PostgreSQL on the same host,
-; we don't need one because we can use peer authentification if our
-; PostgreSQL user matches our unix user.
 password={{ pretix_dbpass }}
-; For MySQL, use local socket, e.g. /var/run/mysqld/mysqld.sock
-; For a remote host, supply an IP address
-; For local postgres authentication, you can leave it empty
-host=
 
 [mail]
-; See config file documentation for more options
 from={{ pretix_mail }}
 host={{ mail_server }}
+tls=on
 
 [redis]
 location=redis://127.0.0.1/0