Remove duplicate setting

installation/pleroma.nginx

@@ -75,8 +75,6 @@ server {
         # this is explicitly IPv4 since Pleroma.Web.Endpoint binds on IPv4 only
         # and `localhost.` resolves to [::0] on some systems: see issue #930
         proxy_pass http://127.0.0.1:4000;
-
-        client_max_body_size 16m;
     }
 
     location ~ ^/(media|proxy) {