🖍 [Attachment Forms] Remove the 'www.' prefix from the displayed publ…

…isher domain in the page attachment header (#36718)

* Remove the 'www.' prefix from the displayed publisher domain in the page attachment header

* Consolidate the two replace() calls into a single call

extensions/amp-story/1.0/amp-story-page-attachment.js

@@ -510,6 +510,6 @@ export class AmpStoryPageAttachment extends DraggableDrawer {
    */
   getPublisherOrigin_() {
     const publisherOrigin = getSourceOrigin(this.getAmpDoc().getUrl());
-    return publisherOrigin.replace(/https?:\/\//, '');
+    return publisherOrigin.replace(/^http(s)?:\/\/(www.)?/, '');
   }
 }