fix: goctl FindOne error (#3731)

tools/goctl/model/sql/template/tpl/find-one.tpl

@@ -18,7 +18,7 @@ func (m *default{{.upperStartCamelObject}}Model) FindOne(ctx context.Context, {{
 	switch err {
 	case nil:
 		return &resp, nil
-	case sqlc.ErrNotFound:
+	case sqlx.ErrNotFound:
 		return nil, ErrNotFound
 	default:
 		return nil, err