chore(library/type_context): fix bogus style warning
chore(library/type_context): fix bogus style warning

fpvandoorn/lean,soonhokong/lean-windows,leanprover/lean,Kha/lean,fgdorais/lean,fgdorais/lean,fpvandoorn/lean,digama0/lean,fgdorais/lean,dselsam/lean,fgdorais/lean,digama0/lean,rlewis1988/lean,johoelzl/lean,fpvandoorn/lean,avigad/lean,leodemoura/lean,dselsam/lean,leodemoura/lean,fgdorais/lean,rlewis1988/lean,leanprover/lean,digama0/lean,leanprover/lean,fpvandoorn/lean,rlewis1988/lean,Kha/lean,avigad/lean,soonhokong/lean-windows,avigad/lean,digama0/lean,leanprover/lean,johoelzl/lean,soonhokong/lean-windows,avigad/lean,leanprover-community/lean,soonhokong/lean-windows,leanprover-community/lean,leanprover-community/lean,leodemoura/lean,dselsam/lean,soonhokong/lean-osx,leanprover-community/lean,leodemoura/lean,rlewis1988/lean,fgdorais/lean,leanprover/lean,johoelzl/lean,leodemoura/lean,dselsam/lean,Kha/lean,dselsam/lean,leanprover-community/lean,soonhokong/lean-osx,leodemoura/lean,Kha/lean,leanprover/lean,fpvandoorn/lean,soonhokong/lean-windows,digama0/lean,avigad/lean,leanprover-community/lean,soonhokong/lean-osx,Kha/lean,Kha/lean,rlewis1988/lean,johoelzl/lean,rlewis1988/lean,soonhokong/lean-osx,johoelzl/lean,johoelzl/lean,fpvandoorn/lean,dselsam/lean,soonhokong/lean-osx,avigad/lean,digama0/lean