Bug: Type 2 warn2normal restoral path omits acknowledgment check

[somethingwithproof]

Summary

In thold_functions.php (line ~3452), the type 2 warn-to-normal restoral path is missing the acknowledgment guard that all other send paths include:

// Type 2 warn2normal (missing acknowledgment check):
if (trim($warning_emails) != '' && $thold_data['restored_alert'] != 'on') {
    thold_mail(...);
}

// Type 0 equivalent (correct):
if (trim($warning_emails) != '' && $thold_data['restored_alert'] != 'on'
    && $thold_data['acknowledgment'] == '') {
    thold_mail(...);
}

Acknowledged time-based thresholds still emit warning restoral emails.

Fix

Add && $thold_data['acknowledgment'] == '' to the type 2 warn2normal send guard.