fix(tests/lean/test_single): fix missing_import test on windows
fix(tests/lean/test_single): fix missing_import test on windows

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