cli: Don't use \r in plain output

These show up as ^M in test logs, and that is irritating.
Just use \n when producing plain output.

Closes: https://github.com/flatpak/flatpak/issues/3226
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f