Fix self-check for mxisd not being enabled

roles/matrix-mxisd/tasks/main.yml

@@ -16,4 +16,6 @@
 - import_tasks: "{{ role_path }}/tasks/self_check_mxisd.yml"
   delegate_to: 127.0.0.1
   become: false
-  when: "run_self_check and matrix_mxisd_enabled"
+  when: "run_self_check and matrix_mxisd_enabled"
+  tags:
+    - self-check