fix(emacs): clear error messages in next-error-mode
fix(emacs): clear error messages in next-error-mode

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