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

webapp/yarn.lock

@@ -5041,9 +5041,9 @@ math-expression-evaluator@^1.2.14:
   version "1.2.16"
   resolved "https://registry.yarnpkg.com/math-expression-evaluator/-/math-expression-evaluator-1.2.16.tgz#b357fa1ca9faefb8e48d10c14ef2bcb2d9f0a7c9"
 
-mattermost-redux@mattermost/mattermost-redux#webapp-master:
+mattermost-redux@mattermost/mattermost-redux#webapp-4.0:
   version "0.0.1"
-  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/b4bab66d36f10ace06bcd3243d68807bfbca9c48"
+  resolved "https://codeload.github.com/mattermost/mattermost-redux/tar.gz/cb3aee571a78c835ed0ff5629114e05fce41a5f5"
   dependencies:
     deep-equal "1.0.1"
     harmony-reflect "1.5.1"