fix: #3625627 Set the default theme of the site template

Rajab Natshahrequested to merge
issue/cucumber_starter-3625627:3625627-default-theme into 1.0.x

Closes #3625627

Set system.theme default to Gin, so a site installed with drush site:install ../recipes/cucumber_starter uses the theme the dashboards and the test screens are designed for, instead of Stark.

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