fix(library/definitional/no_confusion): mark no_confusion as reducible
fix(library/definitional/no_confusion): mark no_confusion as reducible

Auxiliary definitions should be marked as reducible

dselsam/lean,digama0/lean,Kha/lean,digama0/lean,Kha/lean,fgdorais/lean,leodemoura/lean,dselsam/lean,sp3ctum/lean,eigengrau/lean,avigad/lean,levnach/lean,johoelzl/lean,javra/lean,UlrikBuchholtz/lean,fpvandoorn/lean,soonhokong/lean,levnach/lean,soonhokong/lean,rlewis1988/lean,soonhokong/lean-windows,leanprover/lean,javra/lean,sp3ctum/lean,c-cube/lean,leanprover-community/lean,Kha/lean,soonhokong/lean-osx,levnach/lean,leanprover-community/lean,eigengrau/lean,sp3ctum/lean,johoelzl/lean,fpvandoorn/lean,Kha/lean,rlewis1988/lean,rlewis1988/lean,digama0/lean,javra/lean,leanprover/lean,leanprover/lean,leodemoura/lean,leanprover-community/lean,soonhokong/lean-osx,sp3ctum/lean,fpvandoorn/lean,c-cube/lean,soonhokong/lean,leodemoura/lean,rlewis1988/lean,leodemoura/lean,dselsam/lean,rlewis1988/lean,leanprover-community/lean,leanprover/lean,UlrikBuchholtz/lean,c-cube/lean,avigad/lean,UlrikBuchholtz/lean,digama0/lean,Kha/lean,fgdorais/lean,htzh/lean,fpvandoorn/lean2,javra/lean,fpvandoorn/lean,rlewis1988/lean,eigengrau/lean,UlrikBuchholtz/lean,soonhokong/lean,fpvandoorn/lean2,soonhokong/lean-windows,UlrikBuchholtz/lean,levnach/lean,soonhokong/lean-windows,leanprover/lean,fgdorais/lean,eigengrau/lean,leodemoura/lean,c-cube/lean,leodemoura/lean,johoelzl/lean,soonhokong/lean,digama0/lean,htzh/lean,sp3ctum/lean,fgdorais/lean,htzh/lean,soonhokong/lean-windows,fpvandoorn/lean2,soonhokong/lean-windows,Kha/lean,digama0/lean,avigad/lean,fgdorais/lean,javra/lean,dselsam/lean,fgdorais/lean,avigad/lean,fpvandoorn/lean,avigad/lean,soonhokong/lean-osx,johoelzl/lean,johoelzl/lean,soonhokong/lean-osx,leanprover-community/lean,johoelzl/lean,fpvandoorn/lean2,leanprover-community/lean,levnach/lean,fpvandoorn/lean2,htzh/lean,fpvandoorn/lean,dselsam/lean,dselsam/lean,eigengrau/lean,soonhokong/lean-osx,avigad/lean,c-cube/lean,htzh/lean,leanprover/lean