Fix audit log

[DL6ER]

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Fix #1435 by changing the audit log SQL query. This is necessary as #1409 deprecated using SELECT EXISTS(...) to get domain IDs. This PR also adds a test to ensure this cannot happen again and be unnoticed.

[PromoFaux]

Confirmed working

[suterma]

Hi, is there a timeline, for when this gets into production? The audit log is one of the best features for me. I might switch to the devel branch, but not if a release is near. Thanks for the pi-hole so far anyway.

[yubiuser]

A release is near, but no fixed date yet: #1453

[suterma]

Audit log is working for me again, with the most recent update. Many thanks for this useful tool!