fix(library/init/data/setoid): fix redundant parameter
fix(library/init/data/setoid): fix redundant parameter

`setoid.refl` has two instances of `setoid A` in it
dselsam/lean,leanprover/lean,dselsam/lean,dselsam/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,leanprover/lean,digama0/lean,fpvandoorn/lean,Kha/lean,digama0/lean,fpvandoorn/lean,Kha/lean,Kha/lean,leanprover-community/lean,leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover-community/lean,leanprover-community/lean,dselsam/lean,Kha/lean,leodemoura/lean,leodemoura/lean,digama0/lean,leanprover-community/lean,digama0/lean,leanprover/lean,leanprover/lean,leanprover/lean,Kha/lean,leodemoura/lean,digama0/lean,digama0/lean,fpvandoorn/lean,leodemoura/lean,leodemoura/lean,leanprover-community/lean,dselsam/lean,Kha/lean,leodemoura/lean