ui: show code when edit

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.12.24",
+  "version": "4.12.25",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/templates/contest_edit.html

@@ -28,7 +28,7 @@
                  label:'Invitation code',
                  name:'code',
                  placeholder:_('(leave blank if none)'),
-                 value:tdoc.code|default(''),
+                 value:tdoc._code|default(''),
                  row:false
                }) }}
             {{ form.form_checkbox({