Fix CSS bug introduced in the restructuring

Change-Id: I4f41846f5f15ac2676ed444279997eb18744e744
diff --git a/dev/scss/sidebar/sidebar.scss b/dev/scss/sidebar/sidebar.scss
index f9cb33d..5764525 100644
--- a/dev/scss/sidebar/sidebar.scss
+++ b/dev/scss/sidebar/sidebar.scss
@@ -75,7 +75,7 @@
         }
       }
 
-      li.folded {
+      &.folded {
         &.active ul {
           display: block;
         }