Add an ID to the sidebar channel more (#6399)

* Add an ID to the sidebar channel more

For UI Automation

* Add an ID to the Create New Channel button

webapp/components/more_channels/more_channels.jsx

@@ -142,6 +142,7 @@ export default class MoreChannels extends React.Component {
 
         let createNewChannelButton = (
             <button
+                id='createNewChannel'
                 type='button'
                 className='btn btn-primary channel-create-btn'
                 onClick={this.props.handleNewChannel}

webapp/components/sidebar.jsx

@@ -852,6 +852,7 @@ export default class Sidebar extends React.Component {
                         {publicChannelItems}
                         <li>
                             <a
+                                id='sidebarChannelsMore'
                                 href='#'
                                 className='nav-more'
                                 onClick={this.showMoreChannelsModal}