Fix display of transaction post on accounts detail

Bad copy-paste, I assume

templates/account.html

@@ -16,7 +16,7 @@
     <td>{{ record.name }}</a></td>
     <td>{{ record.type }}</td>
     <td>{{ record.amount }}</td>
-    <td>{{ account.posted }}</td>
+    <td>{{ record.posted }}</td>
     <td>
       <form method="POST" action="/update/">
         <input type="hidden" name="account_uuid" value="{{ account.uuid }}"></input>