Update header dropdown class to make it scrollable on smaller viewport height

Author: jackycute

public/views/header.ejs

@@ -123,7 +123,7 @@
                 <a data-target="#" data-toggle="dropdown">
                     Menu <i class="fa fa-caret-down"></i>
                 </a>
-                <ul class="dropdown-menu" role="menu" aria-labelledby="menu">
+                <ul class="dropdown-menu list" role="menu" aria-labelledby="menu">
                     <li class="dropdown-header">Beta</li>
                     <li role="presentation"><a role="menuitem" class="ui-beta-revision" tabindex="-1" data-toggle="modal" data-target="#revisionModal"><i class="fa fa-history fa-fw"></i> Revision</a>
                     </li>