use list-ul icon in list header and web/lists

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

@@ -134,7 +134,7 @@ export default class ListTimeline extends React.PureComponent {
     return (
       <Column ref={this.setRef}>
         <ColumnHeader
-          icon='bars'
+          icon='list-ul'
           active={hasUnread}
           title={title}
           onPin={this.handlePin}

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

@@ -66,7 +66,7 @@ export default class Lists extends ImmutablePureComponent {
           <ColumnSubheading text={intl.formatMessage(messages.subheading)} />
 
           {lists.map(list =>
-            <ColumnLink key={list.get('id')} to={`/timelines/list/${list.get('id')}`} icon='bars' text={list.get('title')} />
+            <ColumnLink key={list.get('id')} to={`/timelines/list/${list.get('id')}`} icon='list-ul' text={list.get('title')} />
           )}
         </div>
       </Column>