Update more tests

test-info.sh was needlessly relying on the exact output
of flatpak info --show-extensions. Update it to match the
new output.

Closes: #2502
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f