Application Homepage shows Books without view permission through shelves #1425

Describe the bug
While using Shelves as the Application Homepage the title of Books without view permission can be viewed. The Shelve page does not show these titles.

Steps To Reproduce
Steps to reproduce the behavior:

1. Go to settings and set Shelves as Application Homepage
2. Create a book in a shelf
3. Set custom permissions so you shouldn't be able to view the book
4. Go to homepage and see the book title in list view

Expected behavior
The title shouldn't be visible like on the default Shelves page.

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): BookStack v0.26.0
• PHP Version: 7.2.10
• Hosting Method (Nginx/Apache/Docker): Apache 2