Fixed fancy plate markup

The markup for fancy plates is invalid. For example, level 3:
```
<div class="table">
  <plate id="fancy"/></plate>
  <plate></plate>
  <bento></bento>
</div>
```

Deleting the extra slash should fix it. The only downside is you don't get a void element for an empty fancy plate (no `<plate id="fancy" />`).