fix handler ansible-lint errors

Author: sjpb

ansible/roles/raid/handlers/main.yml

@@ -1,3 +1,3 @@
 - name: Update GRUB configuration file
   ansible.builtin.command: "grub2-mkconfig -o /boot/grub2/grub.cfg {{ '--update-bls-cmdline' if ansible_distribution_major_version == '9' else '' }}"
-  when: update_grub.changed
+  changed_when: true