Single linebreaks are lost when viewing textnote card

[tainio]

When creating a new note and adding line breaks, the formatting is not preserved when viewing the note. The entire text is displayed on a single line.

Steps to reproduce:

1. Create a new note.
2. Enter text with multiple lines.
3. Save the note.
4. View the note. The text is displayed on a single line.

Note that editing the saved note displays line breaks correctly.

Running v0.18.0 with docker

Expected behavior: The note should be displayed with roughly the same formatting (considering limited space) as it was entered, including line breaks.

[kamtschatka]

indeed, that is quite inconsistent. I have created a PR to fix it.