fix(style): submenu active

close #1332

style/components/menu.less

@@ -48,6 +48,7 @@
   }
 
   &-item-active,
+  &-submenu-active,
   &-submenu-title:hover {
     transform: translateZ(0);
     background-color: tint(@primary-color, 90%);
@@ -122,6 +123,7 @@
       cursor: not-allowed;
     }
   }
+
   & > &-item-divider {
     height: 1px;
     margin: 1px 0;