[BUG] No autofill of alert_owner_id field via batch update

[BogatikovM]

Describe the bug
By closing single alert 'alert_owner_id' field of alert fill automatically (/alerts/update/int:alert_id route). But if alerts closed using 'select' option there is no autofillment (/alerts/batch/update route).

To Reproduce

1. Use 'select' button at top of alerts window
2. Select alerts
3. Use 'close with note' or 'set status' buttons
4. Alerts are closed, but they aren't assigned to anyone

Expected behavior
If multiple alerts closed by 'select' option, they should be assigned to user, who closed them.