Make ntfy not try to listen on a privileged port

We're starting it with `--user` and dropped capabilities, after all.

Hopefully fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2188

roles/matrix-ntfy/templates/ntfy/server.yml.j2

@@ -1,3 +1,4 @@
 base_url: {{ matrix_ntfy_base_url }}
 behind_proxy: true
 cache_file: /data/cache.db
+listen-http: :8080

roles/matrix-ntfy/templates/systemd/matrix-ntfy.service.j2

@@ -21,7 +21,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-ntfy \
 			{% endfor %}
 			--network={{ matrix_docker_network }} \
 			{% if matrix_ntfy_container_http_host_bind_port %}
-			-p {{ matrix_ntfy_container_http_host_bind_port }}:80 \
+			-p {{ matrix_ntfy_container_http_host_bind_port }}:8080 \
 			{% endif %}
 			--mount type=bind,src={{ matrix_ntfy_config_dir_path }},dst=/etc/ntfy,ro \
 			--mount type=bind,src={{ matrix_ntfy_data_path }},dst=/data \