Add [...] menu to search results list (#6663)

* Add [...] menu to search results list

* fix updates on search results when post is pinned or edited

* remove app dispatcher from component

webapp/utils/constants.jsx

@@ -965,7 +965,8 @@ export const Constants = {
         SHOW_USERNAME: 'username',
         SHOW_NICKNAME_FULLNAME: 'nickname_full_name',
         SHOW_FULLNAME: 'full_name'
-    }
+    },
+    SEARCH_POST: 'searchpost'
 };
 
 export default Constants;