fix(issues): fix logic around ood issue assignment

Fix the boolean logic to determine when an issue has the ood scope
assigned and when we want to assign someone to an issue of this kind.
Previously also people who did not opt in were assigned to such issues.

Fixes: 3c472e5 ("feat(issues): allow opt-in assignment for OOD issues")
Signed-off-by: Christian Heusel <christian@heusel.eu>