update: Add information on wheter updates are per-user

Now that flatpak update does both per-user and systemwide
per default it makes a lot of sense to say which one is being
updated.

Closes: #1248
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f