fix(config-ui): extra colon (#6238) (#6260)

Co-authored-by: 青湛 <0x1304570@gmail.com>

Author: github-actions[bot]

config-ui/nginx.conf

@@ -2,7 +2,7 @@ server {
   listen 4000;
   server_name localhost;
   absolute_redirect off;
-  client_max_body_size: 20m;
+  client_max_body_size 20m;
 
 ${SERVER_CONF}