fix: dev: Remove ACL detach deadcode from dyndb

Since `188aa43e`, `dns_acl_any()` can't
fail (and thus would always set memory to its target). Removing deadcode
that would detach the ACL if `dns_acl_any()` would return some error
while the ACL would be created and attached.

Merge branch 'colin/remove-acl-detach-deadcode' into 'main'

See merge request isc-projects/bind9!12333