putting back the mock_skyscraper placement

Author: luc-lisi

examples/react/app/components/navbar/SideBar.tsx

@@ -4,7 +4,7 @@ import { FixedSize } from '@mozilla-services/majc/dist/core'
 export default function SideBar() {
   return (
     <div className="flex flex-col justify-between items-center gap-40 pb-20">
-      <MozAdsPlacement placementId="pocket_skyscraper_1" fixedSize={FixedSize.Skyscraper} />
+      <MozAdsPlacement placementId="mock_pocket_skyscraper_1" fixedSize={FixedSize.Skyscraper} />
     </div>
   )
 }