Remove incorrectly places task

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2297

roles/custom/matrix-dynamic-dns/tasks/main.yml

@@ -1,12 +1,5 @@
 ---
 
-- block:
-    - when: matrix_appservice_slack_enabled | bool
-      ansible.builtin.include_tasks: "{{ role_path }}/tasks/inject_into_nginx_proxy.yml"
-  tags:
-    - setup-all
-    - setup-nginx-proxy
-
 - block:
     - when: matrix_dynamic_dns_enabled | bool
       ansible.builtin.include_tasks: "{{ role_path }}/tasks/validate_config.yml"