uninstall --unused: Don't ask for ok twice

When the uninstall operation was moved to FlatpakCliTransaction the
prompting moved there. Unfortunately some prompting was left over
in the main code, this just deletes that.

This fixes #1928

Closes: #2056
Approved by: alexlarsson
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