fixed broken URLs if listing subcategories instead of products

git-svn-id: https://plugins.svn.wordpress.org/duracelltomi-google-tag-manager/trunk@995925 b8457f37-d9ea-0310-8a92-e5e31aec5664
Preparing release of v0.8.2

git-svn-id: https://plugins.svn.wordpress.org/duracelltomi-google-tag-manager/trunk@995926 b8457f37-d9ea-0310-8a92-e5e31aec5664