Fix failure trying to stop orphaned systemd services

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1461

roles/matrix-synapse/tasks/synapse/workers/setup_uninstall.yml

@@ -8,6 +8,7 @@
     name: "{{ item.key }}"
     state: stopped
   with_dict: "{{ ansible_facts.services|default({})|dict2items|selectattr('key', 'match', 'matrix-synapse-worker-.+\\.service')|list|items2dict }}"
+  when: "item.value['status'] != 'not-found'" # see https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/1461
 
 - name: Find worker configs to be cleaned
   find: