[Glitch] Change single-column mode to scroll the whole page

Port aa22b38fdb to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

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

@@ -125,6 +125,7 @@ class CommunityTimeline extends React.PureComponent {
           timelineId={`community${onlyMedia ? ':media' : ''}`}
           onLoadMore={this.handleLoadMore}
           emptyMessage={<FormattedMessage id='empty_column.community' defaultMessage='The local timeline is empty. Write something publicly to get the ball rolling!' />}
+          bindToDocument={!multiColumn}
         />
       </Column>
     );