fix(library/export): bug in --export-all option
fix(library/export): bug in --export-all option

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