Don't add an unintended new line in code block #1877

Describe the bug
New lines are added automatically when the code block is rendered.
Markdown is the editor.

Steps To Reproduce

Expected behavior
I hope that it does not add an unintended new line.

Screenshots
https://docs.loliot.net/link/133#bkmrk-installation

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): v0.28.0
• PHP Version: 7.2
• Hosting Method (Nginx/Apache/Docker): Apache

Additional context