[jenkins_common] defer to the default location for nginx_template_dir

This fixes a bug introduced in 6d5e7f30

playbooks/roles/jenkins_common/meta/main.yml

@@ -11,7 +11,6 @@ dependencies:
     nginx_server_static_dir: "{{ nginx_data_dir }}/server-static"
     nginx_htpasswd_file: "{{ nginx_app_dir }}/nginx.htpasswd"
     nginx_default_sites: "jenkins"
-    nginx_template_dir: "etc/nginx/sites-available"
     nginx_sites: jenkins
     jenkins_nginx_port: "{{ jenkins_common_nginx_port }}"
     jenkins_server_name: "{{ JENKINS_SERVER_NAME }}"