Remove unnecessary with_items statement

roles/matrix-sygnal/tasks/validate_config.yml

@@ -2,6 +2,4 @@
   fail:
     msg: >-
       Enabling Sygnal requires that you specify at least one app in `matrix_sygnal_apps`
-  with_items:
-    - "matrix_sygnal_access_token"
   when: "matrix_sygnal_enabled and matrix_sygnal_apps|length == 0"