Fix references to flatpak test on SDK

After 18dbcc63 Flatpak tests have been reorganized to better express their intent. During this change an invalid reference on SDK test has been left making test appear as incomplete. Fix the missing reference pointing to the right test case.

https://phabricator.apertis.org/T8170

Signed-off-by: Walter Lozano walter.lozano@collabora.com