Changed how posts are marked ephemeral

web/react/utils/constants.jsx

@@ -128,8 +128,8 @@ export default {
     POST_LOADING: 'loading',
     POST_FAILED: 'failed',
     POST_DELETED: 'deleted',
-    POST_TYPE_JOIN_LEAVE: 'system_join_leave',
     POST_TYPE_EPHEMERAL: 'system_ephemeral',
+    POST_TYPE_JOIN_LEAVE: 'system_join_leave',
     SYSTEM_MESSAGE_PREFIX: 'system_',
     SYSTEM_MESSAGE_PROFILE_NAME: 'System',
     SYSTEM_MESSAGE_PROFILE_IMAGE: '/static/images/logo_compact.png',