dhcp-to-dns: use better condition

The condition worked, but could match others (AAAA, NXDOMAIN, ...) as
well (though these should not exist).

The problem is that matching with `type=A` does not return any results.
For historical reasons A records have no type, thus can be matched with
`!type`. I opened an issue to fix this... (SUP-111312)

So let's assum `!type` works and `type=A` could become valid...

0 files changed, 0 insertions, 0 deletions