Fix out of order posts for admins plus two minor fixes (#6886)

webapp/package.json

@@ -24,7 +24,7 @@
     "localforage": "1.5.0",
     "marked": "mattermost/marked#8f5902fff9bad793cd6c66e0c44002c9e79e1317",
     "match-at": "0.1.0",
-    "mattermost-redux": "mattermost/mattermost-redux#webapp-master",
+    "mattermost-redux": "mattermost/mattermost-redux#webapp-4.0",
     "object-assign": "4.1.1",
     "pdfjs-dist": "1.8.474",
     "perfect-scrollbar": "0.7.1",