Make System module active config save format match the default yml file.

This is a sub-issue of #1938580: [META] Make active config save format match the default yml file (order and quotes).

Files need to be fixed
system.authorize.yml
system.date.yml
system.file.yml
system.mail.yml
system.maintenance.yml
system.menu.yml

Files fixed already
system.cron.yml
system.filter.yml
system.logging.yml
system.module.yml
system.performance.yml
system.rss.yml
system.site.yml
system.theme.yml
system.timezone.yml