fix email as 2fa for sso (#6495)

* fix email as 2fa for sso

* allow saving device without updating `updated_at`

* check if email is some

* allow device to be saved in postgresql

* use twofactor_incomplete table

* no need to update device.updated_at

src/auth.rs

@@ -1223,7 +1223,7 @@ pub async fn refresh_tokens(
     };
 
     // Save to update `updated_at`.
-    device.save(conn).await?;
+    device.save(true, conn).await?;
 
     let user = match User::find_by_uuid(&device.user_uuid, conn).await {
         None => err!("Impossible to find user"),