fix pretty + disabled short tags formatting

[jeetiss]

I use disabled short tags as workaround for bug #1473

this creates problem with closing tag alignment (it always does't have any intent)

PR adds intent for closing tag without children

output before:

    <clipPath id="cp-rf8vUb">
      <path d="M132 0h293v40.5c0 80.91-65.59 146.5-146.5 146.5S132 121.41 132 40.5z">
</path>
    </clipPath>

output after:

    <clipPath id="cp-rf8vUb">
      <path d="M132 0h293v40.5c0 80.91-65.59 146.5-146.5 146.5S132 121.41 132 40.5z">
      </path>
    </clipPath>