Fix typo.

Ansible/roles/debian_server/tasks/btrfs.yml

@@ -46,6 +46,6 @@
 - name: Enable the btrfs check timers
   ansible.builtin.systemd:
     enabled: true
-    name: scrub{{ name }}.timer
+    name: btrfs_check{{ name }}.timer
     state: started
   vars: *vars