Fixed broken TOS modal link

The article link for the modal is not routed correctly.

Test: 
0. Activate the SEO options in Joomla!
1. Create an article
2. Link it in a menu entry
3. assign the article to the TOS field
4. => the link has no ItemId and does ignore all parameters from the menu entry
5. Apply patch
6. Check again => The link should be routed correctly