fix(frontends/lean/decl_util): bad reset in scope destructor
fix(frontends/lean/decl_util): bad reset in scope destructor

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