PLT-4182 Fix incorrect listing for at-mention in comment (#4031)

* Add missing eol

* PLT-4182 Fix incorrect listing for at-mention in comment

Suggestion box for at-mention listed users for the center channel even
if the current textbox is for reply for a post which belongs to a
different channel.

webapp/components/create_comment.jsx

@@ -400,6 +400,7 @@ export default class CreateComment extends React.Component {
                                 createMessage={Utils.localizeMessage('create_comment.addComment', 'Add a comment...')}
                                 initialText=''
                                 supportsCommands={false}
+                                channelId={this.props.channelId}
                                 id='reply_textbox'
                                 ref='textbox'
                             />
@@ -444,4 +445,4 @@ export default class CreateComment extends React.Component {
 CreateComment.propTypes = {
     channelId: React.PropTypes.string.isRequired,
     rootId: React.PropTypes.string.isRequired
-};
+};