[IMP] mail: remove AttachmentViewerComponent/_download

Task-2579306

closes odoo/odoo#87776

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/components/attachment_viewer/attachment_viewer.js

@@ -95,15 +95,6 @@ export class AttachmentViewer extends Component {
         this.attachmentViewer.delete();
     }
 
-    /**
-     * Download the attachment.
-     *
-     * @private
-     */
-    _download() {
-        this.attachmentViewer.attachment.download();
-    }
-
     /**
      * Determine whether the current image is rendered for the 1st time, and if
      * that's the case, display a spinner until loaded.
@@ -320,7 +311,7 @@ export class AttachmentViewer extends Component {
      */
     _onClickDownload(ev) {
         ev.stopPropagation();
-        this._download();
+        this.attachmentViewer.attachment.download();
     }
 
     /**