Fix how a saved search is shared and loaded

Pre-requisites: configure Nuxeo to enable mails and create a user with your email address

Steps to reproduce:

1. Navigate to the Search menu in Web UI
2. Select some criteria
3. Save the search
4. Click on the button to share the saved search
5. In the "Share Saved Search" popup, click on the NEW button
6. In the "Add a Permission" popup, select the user you've created and click on the CREATE button
7. You will receive an email with a link to the saved search
8. Click on this link (make sure you are logged out first)

Observed behavior: The saved search document will be displayed with several 404 errors because some layouts are not found/defined

Expected behavior: The Search menu is displayed and the criteria from the saved search are loaded

The main issue is probably that the Share feature is based on the "Share document" feature, so the URL redirects to a document, instead of the Search drawer/