ui: fix training enroll counter display

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.21.4",
+  "version": "4.21.5",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/templates/partials/homepage/training.html

@@ -9,7 +9,7 @@
           <div class="media">
             <div class="media__left middle">
               <div class="training__participants numbox">
-                <div class="numbox__num large">{{ tdoc['enroll']|default(0) }}</div>
+                <div class="numbox__num large">{{ tdoc.attend|default(0) }}</div>
                 <div class="numbox__text">{{ _('Enrolled') }}</div>
               </div>
             </div>