Fixing attachment in RHS root post for compact view (#3289)

* Fixing attachment in RHS root post for compact view

* Improving spacing for mentions

webapp/components/rhs_root_post.jsx

@@ -175,6 +175,7 @@ export default class RhsRootPost extends React.Component {
                     filenames={post.filenames}
                     channelId={post.channel_id}
                     userId={post.user_id}
+                    compactDisplay={this.props.compactDisplay}
                 />
             );
         }