Fix: unintentional disabling

[mysticatea]

I noticed that <!-- eslint-disable --> affects to the code in <script> element.
This PR fixes vue/comment-directive rule to clear state at the end of <template> element.

<template>
  <!-- eslint-disable -->
  <div id id="a">Hello</div>
</template>
<script>
  var a // `no-unused-vars` rule didn't trigger.
</script>

.... Or I wonder if people expect to share the state between <template> and <script>? I thought no.

<template>
  <!-- eslint-disable -->
  <div id id="a">Hello</div>
</template>
<script>
  /* eslint-enable */
  var a
</script>

[michalsnik]

Great, thank you!