Switching from Coop to Match and looking at Coop level select, shows unknown levels

Title speaks for itself, not aware if this happens in other game-modes though. Upon further inspection, I think the game is actually trying to display the match levels in the Coop level list.

Considering it's 7, I think it's the MP Special Stages.

mentioned in merge request !1180 (merged)

closed via merge request !1180 (merged)

mentioned in commit d4bef36c