change #fff to -white and fix lint issue

bigbluebutton-html5/imports/ui/components/dropdown/list/title/component.jsx

@@ -10,7 +10,7 @@ export default class DropdownListTitle extends Component {
 
   constructor(props) {
     super(props);
-    this.labelID = _.uniqueId("labelContext-");;
+    this.labelID = _.uniqueId("labelContext-");
   }
 
   render() {

bigbluebutton-html5/imports/ui/components/modal/fullscreen/styles.scss

@@ -48,6 +48,6 @@
 }
 
 .confirm {
-  color: #fff !important;
+  color: $color-white !important;
   background-color: $color-link !important;
 }

bigbluebutton-html5/imports/ui/components/user-avatar/styles.scss

@@ -4,7 +4,7 @@
  * ==========
  */
 $user-avatar-border: $color-gray-light;
-$user-avatar-text: #fff;
+$user-avatar-text: $color-white;
 
 $voice-user-bg: $color-success;
 $voice-user-text: $color-gray-light;