Changed information displayed in user list to obey display name settings

web/react/utils/constants.jsx

@@ -437,6 +437,8 @@ export default {
     Preferences: {
         CATEGORY_DIRECT_CHANNEL_SHOW: 'direct_channel_show',
         CATEGORY_DISPLAY_SETTINGS: 'display_settings',
+        DISPLAY_PREFER_NICKNAME: 'nickname_full_name',
+        DISPLAY_PREFER_FULL_NAME: 'full_name',
         CATEGORY_ADVANCED_SETTINGS: 'advanced_settings',
         TUTORIAL_STEP: 'tutorial_step'
     },

web/react/utils/utils.jsx

@@ -1082,9 +1082,9 @@ export function displayUsername(userId) {
 
     let username = '';
     if (user) {
-        if (nameFormat === 'nickname_full_name') {
+        if (nameFormat === Constants.Preferences.DISPLAY_PREFER_NICKNAME) {
             username = user.nickname || getFullName(user);
-        } else if (nameFormat === 'full_name') {
+        } else if (nameFormat === Constants.Preferences.DISPLAY_PREFER_FULL_NAME) {
             username = getFullName(user);
         }
         if (!username.trim().length) {