omit ref and target in external links.

webapp/channels/src/components/invitation_modal/overage_users_banner_notice/index.tsx

@@ -103,8 +103,6 @@ const OverageUsersBannerNotice = () => {
                             <ExternalLink
                                 className='overage_users_banner__button'
                                 href={`${siteURL}/${ConsolePages.LICENSE}?action=show_expansion_modal`}
-                                rel='noopener noreferrer'
-                                target='_blank'
                             >
                                 {chunks}
                             </ExternalLink>