[devtools] use a specific test_db_id when disabling anon The anonymous user is created (or not) in postcreate, which for tests means when creating the cached empty database. The anonymous_allowed=False test classes should thus not share their template db with other test classes, otherwise either they end up with an unexpected anonymous user, or the others miss theirs and things fall apart.

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option_group_changed('cleanup-session-time', 'web', 'main')