Hide duplicate "Hide system messages" at Change Settings/Member Settings, because it's also on card slider.

Thanks to notohiro and xet7 !

Closes #2837

client/components/users/userHeader.jade

@@ -98,12 +98,12 @@ template(name="changeLanguagePopup")
 
 template(name="changeSettingsPopup")
   ul.pop-over-list
-    li
-      a.js-toggle-system-messages
-        i.fa.fa-comments-o
-        | {{_ 'hide-system-messages'}}
-        if hiddenSystemMessages
-          i.fa.fa-check
+    //li
+    //  a.js-toggle-system-messages
+    //    i.fa.fa-comments-o
+    //    | {{_ 'hide-system-messages'}}
+    //    if hiddenSystemMessages
+    //      i.fa.fa-check
     li
       a.js-toggle-desktop-drag-handles
         i.fa.fa-arrows