PLT-7224 - Updating post textbox UI (#7153)

* PLT-7224 - Updating post textbox UI

* Updating post textbox spacing

* Updating emoji icon

webapp/components/post_view/post_info/post_info.jsx

@@ -173,7 +173,10 @@ export default class PostInfo extends React.PureComponent {
                             className='reacticon__container'
                             onClick={this.toggleEmojiPicker}
                         >
-                            <i className='fa fa-smile-o'/>
+                            <span
+                                className='icon icon--emoji'
+                                dangerouslySetInnerHTML={{__html: Constants.EMOJI_ICON_SVG}}
+                            />
                         </a>
                     </span>