[FIX] document_url: Fix Download attachment component

Fix download atachment widget.

Document_url when activated causes error when opening attachment link on the chatter window
This commit (366676cafd) move download buttons into a sub-component.
I modified the module behavior to use canDownload() method instead of adding a t-if in the view and prevent the chatter component from breaking when the message has attachments.

document_url/static/src/js/url.esm.js

@@ -52,6 +52,11 @@ patch(AttachmentList.prototype, {
      *
      * @returns {String}
      */
+    canDownload(attachment) {
+        return (
+            super.canDownload(attachment) && attachment.mimetype != "application/link"
+        );
+    },
     get attachmentUrl() {
         return url("/web/content", {
             id: this.attachment.id,