Prevent pinned columns from scroll to top on URL changing (#3586)

app/javascript/mastodon/features/public_timeline/index.js

@@ -125,6 +125,7 @@ class PublicTimeline extends React.PureComponent {
         <StatusListContainer
           {...this.props}
           type='public'
+          trackScroll={!pinned}
           scrollKey={`public_timeline-${columnId}`}
           emptyMessage={<FormattedMessage id='empty_column.public' defaultMessage='There is nothing here! Write something publicly, or manually follow users from other instances to fill it up' />}
         />