gitlab: Drop removed option which causes gitlab to crash

gitlab_default_can_create_group is removed and setting it crashses
gitlab :/

roles/gitlab/tasks/main.yml

@@ -46,7 +46,6 @@
         letsencrypt['enable'] = true
         letsencrypt['contact_emails'] = ['webmaster@archlinux.org']
         gitlab_rails['lfs_enabled'] = true
-        gitlab_rails['gitlab_default_can_create_group'] = false
         gitlab_rails['gitlab_username_changing_enabled'] = false
         gitlab_rails['initial_root_password'] = "{{ vault_gitlab_root_password }}"
         gitlab_rails['smtp_enable'] = true