[zineshop] remove upload limit for initial batch upload

this should later be set to something more reasonable

machines/fanny/configuration.nix

@@ -160,6 +160,7 @@ in
         proxyPass = "http://10.0.0.15:8080";
         extraConfig = ''
           proxy_set_header Host $host;
+          client_max_body_size 0;
         '';
       };
     };