Only enable Traefik certs dumper if the ACME certificate resolver for Traefik is enabled

If someone disables ACME, then they're using their own certificates
somehow. There's nothing to dump from an `acme.json` file.

group_vars/matrix_servers

@@ -3805,7 +3805,7 @@ devture_traefik_additional_domains_to_obtain_certificates_for: "{{ matrix_ssl_ad
 #                                                                      #
 ########################################################################
 
-devture_traefik_certs_dumper_enabled: "{{ (matrix_playbook_reverse_proxy_type == 'playbook-managed-traefik' and devture_traefik_config_entrypoint_web_secure_enabled) or matrix_playbook_reverse_proxy_type == 'other-traefik-container' }}"
+devture_traefik_certs_dumper_enabled: "{{ (matrix_playbook_reverse_proxy_type == 'playbook-managed-traefik' and devture_traefik_config_entrypoint_web_secure_enabled and devture_traefik_config_certificatesResolvers_acme_enabled) or matrix_playbook_reverse_proxy_type == 'other-traefik-container' }}"
 
 devture_traefik_certs_dumper_identifier: matrix-traefik-certs-dumper