Desktop: Fixes #9786: Rich text editor: Fix newline behavior in new notes

[personalizedrefrigerator]

Summary

This fixes #9786 by adjusting the awfulBrHack (which seems to have caused the original issue).

Testing

1. Switch to the rich text editor
2. Create a new note
3. Press the "bullet list" button
   • Verify that a list item is created
4. Create a new note
5. Type "this is a test", press enter, then type "new line"
6. Press shift-enter, then type "test"
   • Verify that the just-created new line has less space above than the previous.
7. Switch notes
8. Switch back
9. Verify that line spacing hasn't been lost.

This has been tested successfully on Ubuntu 23.10.