Make closing link previews instant, as it should be

We were missing a endResetModel() call, now with it added the removal
happens instantly.

(cherry picked from commit bae4de227c)

src/models/messagecontentmodel.cpp

@@ -645,6 +645,7 @@ void MessageContentModel::closeLinkPreview(int row)
         m_removedLinkPreviews += m_components[row].attributes["link"_ls].toUrl();
         m_components.remove(row);
         m_components.squeeze();
+        endResetModel();
         resetContent();
     }
 }