[Glitch] Always display tab navigation on local/federated timeline even when empty

Port 90b64c0069 to glitch-soc

app/javascript/flavours/glitch/features/community_timeline/index.js

@@ -131,6 +131,7 @@ export default class CommunityTimeline extends React.PureComponent {
 
         <StatusListContainer
           prepend={headline}
+          alwaysPrepend
           trackScroll={!pinned}
           scrollKey={`community_timeline-${columnId}`}
           shouldUpdateScroll={this.shouldUpdateScroll}