update bookmarklet to support iframes in shadow dom

[nonmetalhail]

I found that the bookmarklet doesnt work when an iframe is located inside a shadow DOM because the code only looks for iframes that are part of the base document, not inside the shadow roots. This PR changes the code to also search for iframe elements in all shadowRoots and apply the style element to them.

Unminified bookmarklet:

javascript:(function(){
  var d=document,
      id='phltsbkmklt',
      el=d.getElementById(id),
      f=d.querySelectorAll('iframe'),
      i=0;
  
  if(el){
    function removeFromShadows(root){
      for(var el of root.querySelectorAll('*')){
        if(el.shadowRoot){
          el.shadowRoot.getElementById(id).remove();
          const frames = el.shadowRoot.querySelectorAll('iframe');
          removeFromIFrames(frames);
          removeFromShadows(el.shadowRoot);
        }
      }
    }
    function removeFromIFrames(frames) {
      for(i=0;i<frames.length;i++){
        try{
          frames[i].contentWindow.document.getElementById(id).remove();
          removeFromShadows(frames[i].contentWindow.document);
        }catch(e){
          console.log(e)
        }
      }
    }
    el.remove();
    removeFromIFrames(f);
    removeFromShadows(d);
  }else{
    s=d.createElement('style');
    s.id=id;
    s.appendChild(d.createTextNode('*{line-height:1.5 !important;letter-spacing:0.12em !important;word-spacing:0.16em !important;}p{margin-bottom:2em !important;}'));
    
    function applyToShadows(root){
      for(var el of root.querySelectorAll('*')){
        if(el.shadowRoot){
          el.shadowRoot.appendChild(s.cloneNode(true));
          const frames = el.shadowRoot.querySelectorAll('iframe');
          applyToIFrames(frames);
          applyToShadows(el.shadowRoot);
        }
      }
    }
    function applyToIFrames(frames) {
      for(i=0;i<frames.length;i++){
        try{
          frames[i].contentWindow.document.getElementsByTagName('head')[0].appendChild(s.cloneNode(true));
          applyToShadows(frames[i].contentWindow.document);
        }catch(e){
          console.log(e)
        }
      }
    }
    d.getElementsByTagName('head')[0].appendChild(s);
    applyToIFrames(f);
    applyToShadows(d);
  }
})();