Revert "Updated tags in validate file to include advanced tag"

This reverts commit a8342cb.

Author: chikara1608

build/tasks/validate.js

@@ -313,8 +313,7 @@ const miscTags = [
   'review-item',
   'deprecated',
   'a11y-engine',
-  'a11y-engine-experimental',
-  'a11y-engine-advanced'
+  'a11y-engine-experimental'
 ];
 
 const categories = [