Do not replace history state

This is both for consistency with account timelines and to not mess with
the logic used to decide whether going back in the browser's history is
going to make us leave the WebUI.

app/javascript/flavours/glitch/features/community_timeline/components/section_headline.js

@@ -48,8 +48,8 @@ export default class SectionHeadline extends Component {
           </Fragment>
         ) : (
           <Fragment>
-            <NavLink exact to={to} replace><FormattedMessage id='timeline.posts' defaultMessage='Toots' /></NavLink>
-            <NavLink exact to={`${to}/media`} replace><FormattedMessage id='timeline.media' defaultMessage='Media' /></NavLink>
+            <NavLink exact to={to}><FormattedMessage id='timeline.posts' defaultMessage='Toots' /></NavLink>
+            <NavLink exact to={`${to}/media`}><FormattedMessage id='timeline.media' defaultMessage='Media' /></NavLink>
           </Fragment>
         )}
       </div>