Confirmation Mail: Line breaks missing #3389

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Describe the bug
Line breaks in a confirmation mail are missing in the sent mail.

To Reproduce
Steps to reproduce the behavior:

1. Add a custom confirmation mail text with line breaks
2. Submit a form

Expected behavior
Mail text should have line breaks.

Screenshots
If applicable, add screenshots to help explain your problem.

Nextcloud (please complete the following information):

• Nextcloud-Version: 33.0.3
• Forms-Version: 5.3.0-rc.0

Desktop (please complete the following information):

• OS: Windows
• Browser Firefox
• Version 151.0.3