Use Nextcloud as the default admin account.

- This is because its the only user that exists. I don't understand
- why that would matter, but it seems to. fucking weird.

ansible/group_vars/all/main.yml

@@ -65,5 +65,5 @@ NEXTCLOUD_POSTGRES_DATABASE: "{{ VAULT_NEXTCLOUD_POSTGRES_DATABASE }}"
 NEXTCLOUD_POSTGRES_USER: "{{ VAULT_NEXTCLOUD_POSTGRES_USER }}"
 NEXTCLOUD_POSTGRES_HOST: db:5432
 
-NEXTCLOUD_ADMIN_USER: "{{ VAULT_NEXTCLOUD_ADMIN_USER }}"
+NEXTCLOUD_ADMIN_USER: "nextcloud"
 NEXTCLOUD_ADMIN_PASSWORD: "{{ VAULT_NEXTCLOUD_ADMIN_PASSWORD }}"