Update nginx.conf.j2

roles/matrix-nginx-proxy/templates/nginx/nginx.conf.j2

@@ -44,7 +44,7 @@ http {
 	{% endif %}
 	
 	proxy_connect_timeout       {{ matrix_nginx_proxy_connect_timeout }};
-	proxy_send_timeout          {{  matrix_nginx_proxy_send_timeout: 60 }};
+	proxy_send_timeout          {{  matrix_nginx_proxy_send_timeout }};
 	proxy_read_timeout          {{ matrix_nginx_proxy_read_timeout }};
 	send_timeout                {{ matrix_nginx_send_timeout }};