Fix d.style being undefined and code golf

[shuding]

When using attribute: 'class', the inserted script tag will be:

<script>
!function(){try {
  var d=document.documentElement.classList;
  d.remove('light','dark');
  var e=localStorage.getItem('theme');
  if("system"===e||(!e&&true)){
    var t="(prefers-color-scheme: dark)",m=window.matchMedia(t);
    if(m.media!==t||m.matches){
      d.style.colorScheme = 'dark';
      d.add('dark')
    }else{
      d.style.colorScheme = 'light';
      d.add('light')}
    }else if(e){
      d.add(e|| '')
    }
    if(e==='light'||e==='dark')
      d.style.colorScheme=e
  }catch(e){}
}()
</script>

...where d=document.documentElement.classList but later it tries to access its style property via d.style.colorScheme. Should be using document.documentElement here instead.

This PR changes it to explicitly use d for document.documentElement and c for d.classList.

Also removes a couple of bytes.

[vercel]

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