fix(frontends/lean/decl_cmds): attribute cmd: save info for first ident
fix(frontends/lean/decl_cmds): attribute cmd: save info for first ident

Kha/lean,leanprover-community/lean,Kha/lean,leanprover/lean,leanprover-community/lean,fpvandoorn/lean,leodemoura/lean,Kha/lean,leodemoura/lean,fpvandoorn/lean,fpvandoorn/lean,dselsam/lean,fpvandoorn/lean,digama0/lean,digama0/lean,leanprover/lean,Kha/lean,leanprover/lean,leanprover-community/lean,Kha/lean,Kha/lean,leanprover/lean,dselsam/lean,digama0/lean,dselsam/lean,dselsam/lean,leanprover-community/lean,leanprover/lean,leodemoura/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,leanprover-community/lean,digama0/lean,leanprover-community/lean,leodemoura/lean,digama0/lean,leodemoura/lean,fpvandoorn/lean,dselsam/lean,leodemoura/lean,digama0/lean