Test ng-scrollbar auto-height with root DOM

ng-scrollbar.html

Remove `ngStyle` from `.ng-scrollbar-wrapper` in the template 

<div class="ng-scrollbar-wrapper" [ngAttr]="state" [ngStyle]="autoHeightStyles">

To

<div class="ng-scrollbar-wrapper" [ngAttr]="state">

ng-scrollbar.scss

ng-scrollbar {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  max-height: 100%;
  min-height: 100%;
  max-width: 100%;
  min-width: 100%;
}
.ng-scrollbar-wrapper {
    // comment the following
    //height: 100%;
    //max-height: 100%;
    //min-height: 100%;
    //max-width: 100%;
    //min-width: 100%;
}

ng-scrollbar.ts

@Component({
  selector: 'ng-scrollbar',
  // add the following to host element
  host: {
    '[class.ng-scrollbar]': 'true',
    '[style.height]': 'autoHeightStyles?.height',
    '[style.width]': 'autoHeightStyles?.width',
  }
})