fix menu css

public/ng/css/ui.css

@@ -631,7 +631,6 @@ ul.menu-vertical > li.head,
 ul.menu-down > li.head {
   display: block;
   padding: .4em 1.2em;
-  margin-bottom: 4px;
 }
 ul.menu-vertical > li.down,
 ul.menu-down > li.down {

public/ng/less/ui/menu.less

@@ -71,7 +71,6 @@ ul.menu-down {
   > li.head {
     display: block;
     padding: .4em 1.2em;
-	margin-bottom: 4px;
   }
   > li.down {
     position: relative;