Code Blocks are not getting wrapped in revision diffs #888

• BookStack Version (Found in settings, Please don't put 'latest'): v0.22.0
• PHP Version: PHP 7.0.30-0ubuntu0.16.04.1
• MySQL Version: mysql Ver 15.1 Distrib 10.0.34-MariaDB, for debian-linux-gnu (x86_64)

Expected Behavior

When viewing diffs of different site revisions code blocks should get wrapped

Current Behavior

Code blocks don't get rendered correctly when viewing a diff

Steps to Reproduce

Change something in a code block an view the changes in revision history