docs: fix dynamic-component-loader example for Adblock Plus + EasyList (#27212)

Reported issue in #18138 is due to EasyList being selected in ABP. This commit fixes both the image at the bottom of the Dynamic Component Loader example, and the Stackblitz demo.

Fixes #18138

PR Close #27212

aio/content/examples/dynamic-component-loader/src/app/ad-banner.component.ts

@@ -9,7 +9,7 @@ import { AdComponent } from './ad.component';
   selector: 'app-ad-banner',
   // #docregion ad-host
   template: `
-              <div class="ad-banner">
+              <div class="ad-banner-example">
                 <h3>Advertisements</h3>
                 <ng-template ad-host></ng-template>
               </div>

aio/content/examples/dynamic-component-loader/src/assets/sample.css

@@ -18,6 +18,6 @@
   color: black;
 }
 
-.ad-banner {
+.ad-banner-example {
   width: 400px;
 }