🍒 Prompt for reboot after update again

In !899 (merged), this was changed to show the logout screen with all options. However that doesn't match the UI text of the button that takes you there.

Until we can offer a "reboot or shut down" prompt style and change the UI here appropriately, return to the old style where the prompt matches the button.

(cherry picked from commit db3a920e)

Co-authored-by: Nate Graham nate@kde.org