Gutenberg install hook might conflict with installing sites with drush and "--existing-config"

The issue is that if we save a config file in the install hook, then that saving of the config will mess up for Drupal when trying to figure out which config to keep.

And we don't have to do that either, we can just update the config directly.

I also deleted the optional config, since it's not applicable, as gutenberg requires views.

As anecdotal evidence goes, I can verify this fixes the CI job that was failing without this applied.