Revert "fix"

This reverts commit 3ea5a74d44.

docker/nginx/conf.d/langbot.conf.template

@@ -5,6 +5,7 @@ server {
     listen ${NGINX_PORT};
     server_name langbot.${NGINX_SERVER_NAME};
 
+    // wecom verification
     location = /WW_verify_KiDk4c0uzgf4zc8l.txt {
         default_type text/plain;
         return 200 'KiDk4c0uzgf4zc8l';