剔除 nav 多余选择器

src/css/layui.css

@@ -1285,7 +1285,6 @@ body .layui-table-tips .layui-layer-content{background: none; padding: 0; box-sh
 
 .layui-nav .layui-nav-more{position: absolute; top: 0; right: 3px; left: auto !important; margin-top: 0; font-size: 12px; cursor: pointer; transition: all .2s; -webkit-transition: all .2s;}
 .layui-nav .layui-nav-mored,
-.layui-nav-expand > a .layui-nav-more,
 .layui-nav-itemed > a .layui-nav-more{transform: rotate(180deg);}